diff --git a/app/client/api-client/types.gen.ts b/app/client/api-client/types.gen.ts
index 7873752f..c8b9b5f6 100644
--- a/app/client/api-client/types.gen.ts
+++ b/app/client/api-client/types.gen.ts
@@ -337,14 +337,7 @@ export type ListVolumesResponses = {
     200: Array<{
         id: number;
         shortId: string;
-        provisioningId: string | null;
         name: string;
-        type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
-        status: 'mounted' | 'unmounted' | 'error';
-        lastError: string | null;
-        createdAt: number;
-        updatedAt: number;
-        lastHealthCheck: number;
         config: {
             backend: 'nfs';
             server: string;
@@ -359,6 +352,7 @@ export type ListVolumesResponses = {
             username?: string;
             password?: string;
             guest?: boolean;
+            mapToContainerUidGid?: boolean;
             vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
             domain?: string;
             port?: string | number;
@@ -392,7 +386,15 @@ export type ListVolumesResponses = {
             readOnly?: boolean;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
         };
+        createdAt: number;
+        updatedAt: number;
+        lastHealthCheck: number;
+        type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
+        status: 'mounted' | 'unmounted' | 'error';
+        lastError: string | null;
+        provisioningId?: string | null;
         autoRemount: boolean;
     }>;
 };
@@ -416,6 +418,7 @@ export type CreateVolumeData = {
             username?: string;
             password?: string;
             guest?: boolean;
+            mapToContainerUidGid?: boolean;
             vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
             domain?: string;
             port?: string | number;
@@ -449,6 +452,7 @@ export type CreateVolumeData = {
             readOnly?: boolean;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
         };
     };
     path?: never;
@@ -463,14 +467,7 @@ export type CreateVolumeResponses = {
     201: {
         id: number;
         shortId: string;
-        provisioningId: string | null;
         name: string;
-        type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
-        status: 'mounted' | 'unmounted' | 'error';
-        lastError: string | null;
-        createdAt: number;
-        updatedAt: number;
-        lastHealthCheck: number;
         config: {
             backend: 'nfs';
             server: string;
@@ -485,6 +482,7 @@ export type CreateVolumeResponses = {
             username?: string;
             password?: string;
             guest?: boolean;
+            mapToContainerUidGid?: boolean;
             vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
             domain?: string;
             port?: string | number;
@@ -518,7 +516,15 @@ export type CreateVolumeResponses = {
             readOnly?: boolean;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
         };
+        createdAt: number;
+        updatedAt: number;
+        lastHealthCheck: number;
+        type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
+        status: 'mounted' | 'unmounted' | 'error';
+        lastError: string | null;
+        provisioningId?: string | null;
         autoRemount: boolean;
     };
 };
@@ -541,6 +547,7 @@ export type TestConnectionData = {
             username?: string;
             password?: string;
             guest?: boolean;
+            mapToContainerUidGid?: boolean;
             vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
             domain?: string;
             port?: string | number;
@@ -574,6 +581,7 @@ export type TestConnectionData = {
             readOnly?: boolean;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
         };
     };
     path?: never;
@@ -637,14 +645,7 @@ export type GetVolumeResponses = {
         volume: {
             id: number;
             shortId: string;
-            provisioningId: string | null;
             name: string;
-            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
-            status: 'mounted' | 'unmounted' | 'error';
-            lastError: string | null;
-            createdAt: number;
-            updatedAt: number;
-            lastHealthCheck: number;
             config: {
                 backend: 'nfs';
                 server: string;
@@ -659,6 +660,7 @@ export type GetVolumeResponses = {
                 username?: string;
                 password?: string;
                 guest?: boolean;
+                mapToContainerUidGid?: boolean;
                 vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
                 domain?: string;
                 port?: string | number;
@@ -692,13 +694,21 @@ export type GetVolumeResponses = {
                 readOnly?: boolean;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
             };
+            createdAt: number;
+            updatedAt: number;
+            lastHealthCheck: number;
+            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
+            status: 'mounted' | 'unmounted' | 'error';
+            lastError: string | null;
+            provisioningId?: string | null;
             autoRemount: boolean;
         };
         statfs: {
-            total: number;
-            used: number;
-            free: number;
+            total?: number;
+            used?: number;
+            free?: number;
         };
     };
 };
@@ -723,6 +733,7 @@ export type UpdateVolumeData = {
             username?: string;
             password?: string;
             guest?: boolean;
+            mapToContainerUidGid?: boolean;
             vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
             domain?: string;
             port?: string | number;
@@ -756,6 +767,7 @@ export type UpdateVolumeData = {
             readOnly?: boolean;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
         };
     };
     path: {
@@ -779,14 +791,7 @@ export type UpdateVolumeResponses = {
     200: {
         id: number;
         shortId: string;
-        provisioningId: string | null;
         name: string;
-        type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
-        status: 'mounted' | 'unmounted' | 'error';
-        lastError: string | null;
-        createdAt: number;
-        updatedAt: number;
-        lastHealthCheck: number;
         config: {
             backend: 'nfs';
             server: string;
@@ -801,6 +806,7 @@ export type UpdateVolumeResponses = {
             username?: string;
             password?: string;
             guest?: boolean;
+            mapToContainerUidGid?: boolean;
             vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
             domain?: string;
             port?: string | number;
@@ -834,7 +840,15 @@ export type UpdateVolumeResponses = {
             readOnly?: boolean;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
         };
+        createdAt: number;
+        updatedAt: number;
+        lastHealthCheck: number;
+        type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
+        status: 'mounted' | 'unmounted' | 'error';
+        lastError: string | null;
+        provisioningId?: string | null;
         autoRemount: boolean;
     };
 };
@@ -855,8 +869,8 @@ export type MountVolumeResponses = {
      * Volume mounted successfully
      */
     200: {
-        error?: string;
         status: 'mounted' | 'unmounted' | 'error';
+        error?: string;
     };
 };
 
@@ -876,8 +890,8 @@ export type UnmountVolumeResponses = {
      * Volume unmounted successfully
      */
     200: {
-        error?: string;
         status: 'mounted' | 'unmounted' | 'error';
+        error?: string;
     };
 };
 
@@ -904,8 +918,8 @@ export type HealthCheckVolumeResponses = {
      * Volume health check result
      */
     200: {
-        error?: string;
         status: 'mounted' | 'unmounted' | 'error';
+        error?: string;
     };
 };
 
@@ -932,7 +946,7 @@ export type ListFilesResponses = {
         files: Array<{
             name: string;
             path: string;
-            type: 'file' | 'directory';
+            type: 'directory' | 'file';
             size?: number;
             modifiedAt?: number;
         }>;
@@ -966,8 +980,8 @@ export type BrowseFilesystemResponses = {
         directories: Array<{
             name: string;
             path: string;
-            type: 'file' | 'directory';
-            size?: number;
+            type: 'directory';
+            size?: unknown;
             modifiedAt?: number;
         }>;
         path: string;
@@ -1136,6 +1150,7 @@ export type ListRepositoriesResponses = {
             privateKey: string;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
             isExistingRepository?: boolean;
             customPassword?: string;
             cacert?: string;
@@ -1319,6 +1334,7 @@ export type CreateRepositoryData = {
             privateKey: string;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
             isExistingRepository?: boolean;
             customPassword?: string;
             cacert?: string;
@@ -1557,6 +1573,7 @@ export type GetRepositoryResponses = {
             privateKey: string;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
             isExistingRepository?: boolean;
             customPassword?: string;
             cacert?: string;
@@ -1740,6 +1757,7 @@ export type UpdateRepositoryData = {
             privateKey: string;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
             isExistingRepository?: boolean;
             customPassword?: string;
             cacert?: string;
@@ -1931,6 +1949,7 @@ export type UpdateRepositoryResponses = {
             privateKey: string;
             skipHostKeyCheck?: boolean;
             knownHosts?: string;
+            allowLegacySshRsa?: boolean;
             isExistingRepository?: boolean;
             customPassword?: string;
             cacert?: string;
@@ -2457,14 +2476,7 @@ export type ListBackupSchedulesResponses = {
         volume: {
             id: number;
             shortId: string;
-            provisioningId: string | null;
             name: string;
-            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
-            status: 'mounted' | 'unmounted' | 'error';
-            lastError: string | null;
-            createdAt: number;
-            updatedAt: number;
-            lastHealthCheck: number;
             config: {
                 backend: 'nfs';
                 server: string;
@@ -2479,6 +2491,7 @@ export type ListBackupSchedulesResponses = {
                 username?: string;
                 password?: string;
                 guest?: boolean;
+                mapToContainerUidGid?: boolean;
                 vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
                 domain?: string;
                 port?: string | number;
@@ -2512,7 +2525,15 @@ export type ListBackupSchedulesResponses = {
                 readOnly?: boolean;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
             };
+            createdAt: number;
+            updatedAt: number;
+            lastHealthCheck: number;
+            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
+            status: 'mounted' | 'unmounted' | 'error';
+            lastError: string | null;
+            provisioningId?: string | null;
             autoRemount: boolean;
         };
         repository: {
@@ -2664,6 +2685,7 @@ export type ListBackupSchedulesResponses = {
                 privateKey: string;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
                 isExistingRepository?: boolean;
                 customPassword?: string;
                 cacert?: string;
@@ -2875,14 +2897,7 @@ export type GetBackupScheduleResponses = {
         volume: {
             id: number;
             shortId: string;
-            provisioningId: string | null;
             name: string;
-            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
-            status: 'mounted' | 'unmounted' | 'error';
-            lastError: string | null;
-            createdAt: number;
-            updatedAt: number;
-            lastHealthCheck: number;
             config: {
                 backend: 'nfs';
                 server: string;
@@ -2897,6 +2912,7 @@ export type GetBackupScheduleResponses = {
                 username?: string;
                 password?: string;
                 guest?: boolean;
+                mapToContainerUidGid?: boolean;
                 vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
                 domain?: string;
                 port?: string | number;
@@ -2930,7 +2946,15 @@ export type GetBackupScheduleResponses = {
                 readOnly?: boolean;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
             };
+            createdAt: number;
+            updatedAt: number;
+            lastHealthCheck: number;
+            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
+            status: 'mounted' | 'unmounted' | 'error';
+            lastError: string | null;
+            provisioningId?: string | null;
             autoRemount: boolean;
         };
         repository: {
@@ -3082,6 +3106,7 @@ export type GetBackupScheduleResponses = {
                 privateKey: string;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
                 isExistingRepository?: boolean;
                 customPassword?: string;
                 cacert?: string;
@@ -3274,14 +3299,7 @@ export type GetBackupScheduleForVolumeResponses = {
         volume: {
             id: number;
             shortId: string;
-            provisioningId: string | null;
             name: string;
-            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
-            status: 'mounted' | 'unmounted' | 'error';
-            lastError: string | null;
-            createdAt: number;
-            updatedAt: number;
-            lastHealthCheck: number;
             config: {
                 backend: 'nfs';
                 server: string;
@@ -3296,6 +3314,7 @@ export type GetBackupScheduleForVolumeResponses = {
                 username?: string;
                 password?: string;
                 guest?: boolean;
+                mapToContainerUidGid?: boolean;
                 vers?: '1.0' | '2.0' | '2.1' | '3.0' | 'auto';
                 domain?: string;
                 port?: string | number;
@@ -3329,7 +3348,15 @@ export type GetBackupScheduleForVolumeResponses = {
                 readOnly?: boolean;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
             };
+            createdAt: number;
+            updatedAt: number;
+            lastHealthCheck: number;
+            type: 'nfs' | 'smb' | 'directory' | 'webdav' | 'rclone' | 'sftp';
+            status: 'mounted' | 'unmounted' | 'error';
+            lastError: string | null;
+            provisioningId?: string | null;
             autoRemount: boolean;
         };
         repository: {
@@ -3481,6 +3508,7 @@ export type GetBackupScheduleForVolumeResponses = {
                 privateKey: string;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
                 isExistingRepository?: boolean;
                 customPassword?: string;
                 cacert?: string;
@@ -3955,6 +3983,7 @@ export type GetScheduleMirrorsResponses = {
                 privateKey: string;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
                 isExistingRepository?: boolean;
                 customPassword?: string;
                 cacert?: string;
@@ -4167,6 +4196,7 @@ export type UpdateScheduleMirrorsResponses = {
                 privateKey: string;
                 skipHostKeyCheck?: boolean;
                 knownHosts?: string;
+                allowLegacySshRsa?: boolean;
                 isExistingRepository?: boolean;
                 customPassword?: string;
                 cacert?: string;
diff --git a/app/client/modules/repositories/components/create-repository-form.tsx b/app/client/modules/repositories/components/create-repository-form.tsx
index 54b0ffc3..ae808ece 100644
--- a/app/client/modules/repositories/components/create-repository-form.tsx
+++ b/app/client/modules/repositories/components/create-repository-form.tsx
@@ -92,7 +92,13 @@ const defaultValuesForType = (repoBase: string) => ({
 	azure: { backend: "azure" as const, compressionMode: "auto" as const },
 	rclone: { backend: "rclone" as const, compressionMode: "auto" as const },
 	rest: { backend: "rest" as const, compressionMode: "auto" as const },
-	sftp: { backend: "sftp" as const, compressionMode: "auto" as const, port: 22, skipHostKeyCheck: false },
+	sftp: {
+		backend: "sftp" as const,
+		compressionMode: "auto" as const,
+		port: 22,
+		skipHostKeyCheck: false,
+		allowLegacySshRsa: false,
+	},
 });
 
 export const CreateRepositoryForm = ({
@@ -251,7 +257,9 @@ export const CreateRepositoryForm = ({
 							</FormControl>
 							<div className="space-y-1">
 								<FormLabel>Import existing repository</FormLabel>
-								<FormDescription>Check this if the repository already exists at the specified location</FormDescription>
+								<FormDescription>
+									Check this if the repository already exists at the specified location
+								</FormDescription>
 							</div>
 						</FormItem>
 					)}
@@ -281,8 +289,8 @@ export const CreateRepositoryForm = ({
 								</SelectContent>
 							</Select>
 							<FormDescription>
-								Choose whether to use Zerobyte's recovery key (which you downloaded when creating your account) or enter
-								a custom password for the existing repository.
+								Choose whether to use Zerobyte's recovery key (which you downloaded when creating your
+								account) or enter a custom password for the existing repository.
 							</FormDescription>
 						</FormItem>
 
diff --git a/app/client/modules/repositories/components/repository-forms/advanced-tls-form.tsx b/app/client/modules/repositories/components/repository-forms/advanced-tls-form.tsx
index 57eeddb6..2fe28c9d 100644
--- a/app/client/modules/repositories/components/repository-forms/advanced-tls-form.tsx
+++ b/app/client/modules/repositories/components/repository-forms/advanced-tls-form.tsx
@@ -26,6 +26,7 @@ export const AdvancedForm = ({ form }: Props) => {
 	const cacert = useWatch({ control: form.control, name: "cacert" });
 	const uploadLimitEnabled = useWatch({ control: form.control, name: "uploadLimit.enabled" });
 	const downloadLimitEnabled = useWatch({ control: form.control, name: "downloadLimit.enabled" });
+	const backend = useWatch({ control: form.control, name: "backend" });
 
 	return (
 		<Collapsible>
@@ -44,7 +45,9 @@ export const AdvancedForm = ({ form }: Props) => {
 										</FormControl>
 										<div className="space-y-1">
 											<FormLabel>Enable upload speed limit</FormLabel>
-											<FormDescription className="text-xs">Limit upload speed to the repository</FormDescription>
+											<FormDescription className="text-xs">
+												Limit upload speed to the repository
+											</FormDescription>
 										</div>
 									</FormItem>
 								)}
@@ -66,7 +69,9 @@ export const AdvancedForm = ({ form }: Props) => {
 														placeholder="10"
 														className="pr-12"
 														{...field}
-														onChange={(e) => field.onChange(parseFloat(e.target.value) || 1)}
+														onChange={(e) =>
+															field.onChange(parseFloat(e.target.value) || 1)
+														}
 													/>
 													<div className="absolute inset-y-0 right-0 flex items-center pr-3">
 														<div className="h-4 w-px bg-border" />
@@ -120,7 +125,9 @@ export const AdvancedForm = ({ form }: Props) => {
 									</FormControl>
 									<div className="space-y-1">
 										<FormLabel>Enable download speed limit</FormLabel>
-										<FormDescription className="text-xs">Limit download speed from the repository</FormDescription>
+										<FormDescription className="text-xs">
+											Limit download speed from the repository
+										</FormDescription>
 									</div>
 								</FormItem>
 							)}
@@ -144,7 +151,9 @@ export const AdvancedForm = ({ form }: Props) => {
 														disabled={!downloadLimitEnabled}
 														className="pr-12"
 														{...field}
-														onChange={(e) => field.onChange(parseFloat(e.target.value) || 1)}
+														onChange={(e) =>
+															field.onChange(parseFloat(e.target.value) || 1)
+														}
 													/>
 													<div className="absolute inset-y-0 right-0 flex items-center pr-3">
 														<div className="h-4 w-px bg-border" />
@@ -208,8 +217,8 @@ export const AdvancedForm = ({ form }: Props) => {
 									</TooltipTrigger>
 									<TooltipContent className={cn({ hidden: !cacert })}>
 										<p className="max-w-xs">
-											This option is disabled because a CA certificate is provided. Remove the CA certificate to skip
-											TLS validation instead.
+											This option is disabled because a CA certificate is provided. Remove the CA
+											certificate to skip TLS validation instead.
 										</p>
 									</TooltipContent>
 								</Tooltip>
@@ -217,8 +226,8 @@ export const AdvancedForm = ({ form }: Props) => {
 							<div className="space-y-1 leading-none">
 								<FormLabel>Skip TLS certificate verification</FormLabel>
 								<FormDescription>
-									Disable TLS certificate verification for HTTPS connections with self-signed certificates. This is
-									insecure and should only be used for testing.
+									Disable TLS certificate verification for HTTPS connections with self-signed
+									certificates. This is insecure and should only be used for testing.
 								</FormDescription>
 							</div>
 						</FormItem>
@@ -235,7 +244,9 @@ export const AdvancedForm = ({ form }: Props) => {
 									<TooltipTrigger asChild>
 										<div>
 											<Textarea
-												placeholder={"-----BEGIN CERTIFICATE-----\n...\n-----END CERTIFICATE-----"}
+												placeholder={
+													"-----BEGIN CERTIFICATE-----\n...\n-----END CERTIFICATE-----"
+												}
 												rows={6}
 												disabled={insecureTls}
 												{...field}
@@ -244,8 +255,8 @@ export const AdvancedForm = ({ form }: Props) => {
 									</TooltipTrigger>
 									<TooltipContent className={cn({ hidden: !insecureTls })}>
 										<p className="max-w-xs">
-											CA certificate is disabled because TLS validation is being skipped. Uncheck "Skip TLS Certificate
-											Verification" to provide a custom CA certificate.
+											CA certificate is disabled because TLS validation is being skipped. Uncheck
+											"Skip TLS Certificate Verification" to provide a custom CA certificate.
 										</p>
 									</TooltipContent>
 								</Tooltip>
@@ -266,6 +277,26 @@ export const AdvancedForm = ({ form }: Props) => {
 						</FormItem>
 					)}
 				/>
+				{backend === "sftp" && (
+					<FormField
+						control={form.control}
+						name="allowLegacySshRsa"
+						render={({ field }) => (
+							<FormItem className="flex flex-row items-center justify-between rounded-lg border p-3 shadow-sm">
+								<div className="space-y-0.5">
+									<FormLabel>Allow legacy SSH RSA/SHA1 algorithms</FormLabel>
+									<FormDescription>
+										Only enable this for legacy SFTP servers that offer <code>ssh-rsa</code> only.
+										It permits RSA/SHA1 signatures, which are weaker than modern SSH algorithms.
+									</FormDescription>
+								</div>
+								<FormControl>
+									<Checkbox checked={field.value ?? false} onCheckedChange={field.onChange} />
+								</FormControl>
+							</FormItem>
+						)}
+					/>
+				)}
 			</CollapsibleContent>
 		</Collapsible>
 	);
diff --git a/app/client/modules/volumes/components/create-volume-form.tsx b/app/client/modules/volumes/components/create-volume-form.tsx
index 86ecec24..1c3ebcb1 100644
--- a/app/client/modules/volumes/components/create-volume-form.tsx
+++ b/app/client/modules/volumes/components/create-volume-form.tsx
@@ -69,7 +69,7 @@ const defaultValuesForType = {
 	smb: { backend: "smb" as const, port: 445, vers: "3.0" as const, mapToContainerUidGid: false },
 	webdav: { backend: "webdav" as const, port: 80, ssl: false, path: "/webdav" },
 	rclone: { backend: "rclone" as const, path: "/" },
-	sftp: { backend: "sftp" as const, port: 22, path: "/", skipHostKeyCheck: false },
+	sftp: { backend: "sftp" as const, port: 22, path: "/", skipHostKeyCheck: false, allowLegacySshRsa: false },
 };
 
 export const CreateVolumeForm = ({ onSubmit, mode = "create", initialValues, formId, loading, className }: Props) => {
@@ -230,7 +230,10 @@ export const CreateVolumeForm = ({ onSubmit, mode = "create", initialValues, for
 										<Tooltip>
 											<TooltipTrigger asChild>
 												<div>
-													<SelectItem disabled={!capabilities.rclone || !capabilities.sysAdmin} value="rclone">
+													<SelectItem
+														disabled={!capabilities.rclone || !capabilities.sysAdmin}
+														value="rclone"
+													>
 														rclone
 													</SelectItem>
 												</div>
@@ -238,7 +241,11 @@ export const CreateVolumeForm = ({ onSubmit, mode = "create", initialValues, for
 											<TooltipContent className={cn({ hidden: capabilities.sysAdmin })}>
 												<p>Remote mounts require SYS_ADMIN capability</p>
 											</TooltipContent>
-											<TooltipContent className={cn({ hidden: !capabilities.sysAdmin || capabilities.rclone })}>
+											<TooltipContent
+												className={cn({
+													hidden: !capabilities.sysAdmin || capabilities.rclone,
+												})}
+											>
 												<p>Setup rclone to use this backend</p>
 											</TooltipContent>
 										</Tooltip>
diff --git a/app/client/modules/volumes/components/volume-forms/sftp-form.tsx b/app/client/modules/volumes/components/volume-forms/sftp-form.tsx
index 869d9ead..b2536880 100644
--- a/app/client/modules/volumes/components/volume-forms/sftp-form.tsx
+++ b/app/client/modules/volumes/components/volume-forms/sftp-form.tsx
@@ -12,6 +12,7 @@ import { Input } from "../../../../components/ui/input";
 import { SecretInput } from "../../../../components/ui/secret-input";
 import { Textarea } from "../../../../components/ui/textarea";
 import { Switch } from "../../../../components/ui/switch";
+import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "../../../../components/ui/collapsible";
 
 type Props = {
 	form: UseFormReturn<FormValues>;
@@ -78,7 +79,9 @@ export const SFTPForm = ({ form }: Props) => {
 						<FormControl>
 							<SecretInput placeholder="••••••••" value={field.value ?? ""} onChange={field.onChange} />
 						</FormControl>
-						<FormDescription>Password for SFTP authentication (optional if using private key).</FormDescription>
+						<FormDescription>
+							Password for SFTP authentication (optional if using private key).
+						</FormDescription>
 						<FormMessage />
 					</FormItem>
 				)}
@@ -98,7 +101,9 @@ export const SFTPForm = ({ form }: Props) => {
 								value={field.value ?? ""}
 							/>
 						</FormControl>
-						<FormDescription>SSH private key for authentication (optional if using password).</FormDescription>
+						<FormDescription>
+							SSH private key for authentication (optional if using password).
+						</FormDescription>
 						<FormMessage />
 					</FormItem>
 				)}
@@ -158,6 +163,29 @@ export const SFTPForm = ({ form }: Props) => {
 					)}
 				/>
 			)}
+			<Collapsible>
+				<CollapsibleTrigger>Advanced Settings</CollapsibleTrigger>
+				<CollapsibleContent className="pb-4 pt-4">
+					<FormField
+						control={form.control}
+						name="allowLegacySshRsa"
+						render={({ field }) => (
+							<FormItem className="flex flex-row items-center justify-between rounded-lg border p-3 shadow-sm">
+								<div className="space-y-0.5">
+									<FormLabel>Allow legacy SSH RSA/SHA1 algorithms</FormLabel>
+									<FormDescription>
+										Only enable this for legacy SFTP servers that offer <code>ssh-rsa</code> only.
+										It permits RSA/SHA1 signatures, which are weaker than modern SSH algorithms.
+									</FormDescription>
+								</div>
+								<FormControl>
+									<Switch checked={field.value ?? false} onCheckedChange={field.onChange} />
+								</FormControl>
+							</FormItem>
+						)}
+					/>
+				</CollapsibleContent>
+			</Collapsible>
 		</>
 	);
 };
diff --git a/app/client/modules/volumes/tabs/info.tsx b/app/client/modules/volumes/tabs/info.tsx
index 7529c7ec..cee63f0c 100644
--- a/app/client/modules/volumes/tabs/info.tsx
+++ b/app/client/modules/volumes/tabs/info.tsx
@@ -33,7 +33,9 @@ function ConfigRow({ icon, label, value, mono }: ConfigRowProps) {
 		<div className="flex items-center gap-3 py-3 first:pt-0 last:pb-0">
 			<span className="text-muted-foreground shrink-0">{icon}</span>
 			<span className="text-sm text-muted-foreground w-40 shrink-0">{label}</span>
-			<span className={cn("text-sm break-all", { "font-mono bg-muted/50 px-2 py-0.5 rounded": mono })}>{value}</span>
+			<span className={cn("text-sm break-all", { "font-mono bg-muted/50 px-2 py-0.5 rounded": mono })}>
+				{value}
+			</span>
 		</div>
 	);
 }
@@ -43,12 +45,19 @@ function BackendConfigRows({ volume }: { volume: Volume }) {
 
 	switch (config.backend) {
 		case "directory":
-			return <ConfigRow icon={<FolderOpen className="h-4 w-4" />} label="Directory Path" value={config.path} mono />;
+			return (
+				<ConfigRow icon={<FolderOpen className="h-4 w-4" />} label="Directory Path" value={config.path} mono />
+			);
 		case "nfs":
 			return (
 				<>
 					<ConfigRow icon={<FolderOpen className="h-4 w-4" />} label="Server" value={config.server} mono />
-					<ConfigRow icon={<FolderOpen className="h-4 w-4" />} label="Export Path" value={config.exportPath} mono />
+					<ConfigRow
+						icon={<FolderOpen className="h-4 w-4" />}
+						label="Export Path"
+						value={config.exportPath}
+						mono
+					/>
 				</>
 			);
 		case "smb":
@@ -84,6 +93,8 @@ function BackendConfigRows({ volume }: { volume: Volume }) {
 }
 
 function DonutChart({ statfs }: { statfs: StatFs }) {
+	const { used = 0, total = 0 } = statfs;
+
 	const chartData = useMemo(
 		() => [
 			{ name: "Used", value: statfs.used, fill: "var(--strong-accent)" },
@@ -93,8 +104,8 @@ function DonutChart({ statfs }: { statfs: StatFs }) {
 	);
 
 	const usagePercentage = useMemo(() => {
-		return Math.round((statfs.used / statfs.total) * 100);
-	}, [statfs]);
+		return Math.round((used / total) * 100);
+	}, [used, total]);
 
 	return (
 		<ChartContainer config={{}} className="mx-auto aspect-square max-h-[200px]">
@@ -114,10 +125,18 @@ function DonutChart({ statfs }: { statfs: StatFs }) {
 							if (viewBox && "cx" in viewBox && "cy" in viewBox) {
 								return (
 									<text x={viewBox.cx} y={viewBox.cy} textAnchor="middle" dominantBaseline="middle">
-										<tspan x={viewBox.cx} y={viewBox.cy} className="fill-foreground text-2xl font-bold">
+										<tspan
+											x={viewBox.cx}
+											y={viewBox.cy}
+											className="fill-foreground text-2xl font-bold"
+										>
 											{usagePercentage}%
 										</tspan>
-										<tspan x={viewBox.cx} y={(viewBox.cy || 0) + 20} className="fill-muted-foreground text-xs">
+										<tspan
+											x={viewBox.cx}
+											y={(viewBox.cy || 0) + 20}
+											className="fill-muted-foreground text-xs"
+										>
 											Used
 										</tspan>
 									</text>
@@ -132,7 +151,9 @@ function DonutChart({ statfs }: { statfs: StatFs }) {
 }
 
 export const VolumeInfoTabContent = ({ volume, statfs }: Props) => {
-	const hasStorage = statfs.total > 0;
+	const { total = 0, used = 0, free = 0 } = statfs;
+
+	const hasStorage = total > 0;
 
 	return (
 		<Card className="px-6 py-6 @container/inner">
@@ -144,7 +165,11 @@ export const VolumeInfoTabContent = ({ volume, statfs }: Props) => {
 					</CardTitle>
 					<div className="space-y-0 divide-y divide-border/50">
 						<ConfigRow icon={<HardDrive className="h-4 w-4" />} label="Name" value={volume.name} />
-						<ConfigRow icon={<HardDrive className="h-4 w-4" />} label="Backend" value={backendLabels[volume.type]} />
+						<ConfigRow
+							icon={<HardDrive className="h-4 w-4" />}
+							label="Backend"
+							value={backendLabels[volume.type]}
+						/>
 						<BackendConfigRows volume={volume} />
 					</div>
 				</div>
@@ -162,21 +187,21 @@ export const VolumeInfoTabContent = ({ volume, statfs }: Props) => {
 									<HardDrive className="h-4 w-4 text-muted-foreground" />
 									<span className="text-sm font-medium">Total</span>
 								</div>
-								<ByteSize bytes={statfs.total} className="font-mono text-sm" />
+								<ByteSize bytes={total} className="font-mono text-sm" />
 							</div>
 							<div className="flex items-center justify-between p-3 rounded-lg bg-muted/50">
 								<div className="flex items-center gap-3">
 									<div className="h-3 w-3 rounded-full bg-strong-accent" />
 									<span className="text-sm font-medium">Used</span>
 								</div>
-								<ByteSize bytes={statfs.used} className="font-mono text-sm" />
+								<ByteSize bytes={used} className="font-mono text-sm" />
 							</div>
 							<div className="flex items-center justify-between p-3 rounded-lg bg-muted/50">
 								<div className="flex items-center gap-3">
 									<div className="h-3 w-3 rounded-full bg-primary" />
 									<span className="text-sm font-medium">Free</span>
 								</div>
-								<ByteSize bytes={statfs.free} className="font-mono text-sm" />
+								<ByteSize bytes={free} className="font-mono text-sm" />
 							</div>
 						</div>
 					</div>
diff --git a/app/server/modules/backups/__tests__/backups.service.execution.test.ts b/app/server/modules/backups/__tests__/backups.service.execution.test.ts
index 6e1ad0a5..a1fb65f8 100644
--- a/app/server/modules/backups/__tests__/backups.service.execution.test.ts
+++ b/app/server/modules/backups/__tests__/backups.service.execution.test.ts
@@ -279,6 +279,7 @@ describe("backup execution - validation failures", () => {
 				privateKey: "key",
 				path: "/data",
 				skipHostKeyCheck: false,
+				allowLegacySshRsa: false,
 			},
 		});
 		const repository = await createTestRepository();
diff --git a/app/test/backend-integration/setup-target.sh b/app/test/backend-integration/setup-target.sh
index f774b30d..4c0987d3 100755
--- a/app/test/backend-integration/setup-target.sh
+++ b/app/test/backend-integration/setup-target.sh
@@ -57,6 +57,7 @@ public_key="$(printf '%s' "$7" | base64 -d)"
 repo_path="/srv/zerobyte-backend-integration/restic-repo"
 repo_password_fingerprint_path="$repo_path/.zerobyte-password-sha256"
 repo_password_fingerprint="$(printf '%s' "$restic_password" | sha256sum | cut -d' ' -f1)"
+legacy_sshd_dir="/etc/ssh/zerobyte-backend-integration-legacy"
 
 export DEBIAN_FRONTEND=noninteractive
 
@@ -158,6 +159,11 @@ EOF
 a2ensite zerobyte-backend-integration-dav >/dev/null
 apache2ctl configtest
 
+install -d -m 0700 "$legacy_sshd_dir"
+if [[ ! -f "$legacy_sshd_dir/ssh_host_rsa_key" ]]; then
+	ssh-keygen -q -t rsa -b 2048 -N "" -f "$legacy_sshd_dir/ssh_host_rsa_key"
+fi
+
 install -d -m 0755 /etc/ssh/sshd_config.d
 write_file /etc/ssh/sshd_config.d/zerobyte-backend-integration.conf <<'EOF'
 Match User zerobyte-sftp
@@ -170,17 +176,68 @@ Match User zerobyte-sftp
 EOF
 sshd -t
 
+write_file "$legacy_sshd_dir/sshd_config" <<EOF
+Port 2222
+ListenAddress 0.0.0.0
+PidFile /run/zerobyte-backend-integration-legacy-sshd.pid
+HostKey $legacy_sshd_dir/ssh_host_rsa_key
+HostKeyAlgorithms ssh-rsa
+PasswordAuthentication yes
+PubkeyAuthentication no
+KbdInteractiveAuthentication no
+PermitRootLogin no
+PermitTTY no
+X11Forwarding no
+AllowTcpForwarding no
+Subsystem sftp internal-sftp
+
+Match User zerobyte-sftp
+	ForceCommand internal-sftp
+EOF
+sshd -t -f "$legacy_sshd_dir/sshd_config"
+
+write_file /etc/systemd/system/zerobyte-backend-integration-legacy-sshd.service <<EOF
+[Unit]
+Description=Zerobyte Backend Integration Legacy SFTP
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/sbin/sshd -D -f $legacy_sshd_dir/sshd_config
+ExecReload=/bin/kill -HUP \$MAINPID
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target
+EOF
+systemctl daemon-reload
+systemctl enable --now zerobyte-backend-integration-legacy-sshd.service
+
 systemctl restart apache2
 systemctl restart smbd
 systemctl restart ssh
+systemctl restart zerobyte-backend-integration-legacy-sshd.service
+systemctl is-active --quiet zerobyte-backend-integration-legacy-sshd.service
+for _ in 1 2 3 4 5; do
+	ss -ltn | grep -q ':2222' && break
+	sleep 1
+done
+ss -ltn | grep -q ':2222'
 REMOTE
 
 ssh-keyscan "$TARGET_HOST" >"$KNOWN_HOSTS_PATH" 2>/dev/null
+if ! ssh-keyscan -T 5 -p 2222 "$TARGET_HOST" >>"$KNOWN_HOSTS_PATH" 2>/dev/null; then
+	echo "Failed to scan legacy SFTP host key from $TARGET_HOST:2222" >&2
+	echo "Check the target service with:" >&2
+	echo "  ssh $TARGET systemctl status zerobyte-backend-integration-legacy-sshd.service" >&2
+	exit 1
+fi
 
 INTEGRATION_HOST="$TARGET_HOST" \
 	FIXTURE_UID="$FIXTURE_UID" \
 	FIXTURE_GID="$FIXTURE_GID" \
 	SMB_PASSWORD="$SMB_PASSWORD" \
+	SFTP_PASSWORD="$SFTP_PASSWORD" \
 	WEBDAV_PASSWORD="$WEBDAV_PASSWORD" \
 	RESTIC_PASSWORD="$RESTIC_PASSWORD" \
 	SFTP_KEY_PATH="$KEY_PATH" \
diff --git a/app/test/backend-integration/write-generated-config.ts b/app/test/backend-integration/write-generated-config.ts
index bb515c24..3f93be29 100644
--- a/app/test/backend-integration/write-generated-config.ts
+++ b/app/test/backend-integration/write-generated-config.ts
@@ -12,6 +12,7 @@ const host = getRequiredEnv("INTEGRATION_HOST");
 const fixtureUid = getRequiredNumberEnv("FIXTURE_UID");
 const fixtureGid = getRequiredNumberEnv("FIXTURE_GID");
 const smbPassword = getRequiredEnv("SMB_PASSWORD");
+const sftpPassword = getRequiredEnv("SFTP_PASSWORD");
 const webdavPassword = getRequiredEnv("WEBDAV_PASSWORD");
 const resticPassword = getRequiredEnv("RESTIC_PASSWORD");
 const privateKey = fs.readFileSync(getRequiredEnv("SFTP_KEY_PATH"), "utf8");
@@ -29,7 +30,7 @@ const nfsEntries = [
 
 const smbEntries = [
 	{ path: "hello.txt", type: "file", uid: fixtureUid, gid: fixtureGid, mode: "0644", text: fileText },
-	{ path: "docs", type: "directory", uid: fixtureUid, gid: fixtureGid, mode: "0755" },
+	{ path: "docs", type: "directory", uid: fixtureUid, gid: fixtureGid, mode: "1755" },
 	{ path: "docs/readme.md", type: "file", uid: fixtureUid, gid: fixtureGid, mode: "0644", text: readmeText },
 ];
 
@@ -90,6 +91,41 @@ const config = {
 			fixtureRoot: "case-a",
 			expectedEntries: contentOnlyEntries,
 		},
+		{
+			id: "sftp-password-local-repo",
+			volume: {
+				backend: "sftp",
+				host,
+				port: 22,
+				username: "zerobyte-sftp",
+				password: sftpPassword,
+				path: "/srv/zerobyte-backend-integration/fixtures",
+				readOnly: true,
+				skipHostKeyCheck: false,
+				knownHosts,
+			},
+			repository: { backend: "local", path: "repo-sftp-password-volume" },
+			fixtureRoot: "case-a",
+			expectedEntries: contentOnlyEntries,
+		},
+		{
+			id: "sftp-legacy-rsa-hostkey-local-repo",
+			volume: {
+				backend: "sftp",
+				host,
+				port: 2222,
+				username: "zerobyte-sftp",
+				password: sftpPassword,
+				path: "/srv/zerobyte-backend-integration/fixtures",
+				readOnly: true,
+				skipHostKeyCheck: false,
+				knownHosts,
+				allowLegacySshRsa: true,
+			},
+			repository: { backend: "local", path: "repo-sftp-legacy-rsa-hostkey-volume" },
+			fixtureRoot: "case-a",
+			expectedEntries: contentOnlyEntries,
+		},
 		{
 			id: "webdav-local-repo",
 			volume: {
diff --git a/apps/agent/src/volume-host/backends/sftp.ts b/apps/agent/src/volume-host/backends/sftp.ts
index 802f021c..8d917428 100644
--- a/apps/agent/src/volume-host/backends/sftp.ts
+++ b/apps/agent/src/volume-host/backends/sftp.ts
@@ -142,6 +142,10 @@ const mount = async (config: BackendConfig, mountPath: string) => {
 			`gid=${gid}`,
 		];
 
+		if (config.allowLegacySshRsa) {
+			options.push("HostKeyAlgorithms=+ssh-rsa", "ssh_command=ssh -oPubkeyAcceptedAlgorithms=+ssh-rsa");
+		}
+
 		if (config.skipHostKeyCheck) {
 			options.push("StrictHostKeyChecking=no", "UserKnownHostsFile=/dev/null");
 		} else if (config.knownHosts) {
diff --git a/packages/contracts/src/volumes.ts b/packages/contracts/src/volumes.ts
index 669d8c77..2eb64beb 100644
--- a/packages/contracts/src/volumes.ts
+++ b/packages/contracts/src/volumes.ts
@@ -85,6 +85,7 @@ export const sftpConfigSchema = z.object({
 	readOnly: z.boolean().optional(),
 	skipHostKeyCheck: z.boolean().default(false),
 	knownHosts: z.string().optional(),
+	allowLegacySshRsa: z.boolean().default(false),
 });
 
 export const volumeConfigSchema = z.discriminatedUnion("backend", [
diff --git a/packages/core/src/restic/helpers/__tests__/build-env.test.ts b/packages/core/src/restic/helpers/__tests__/build-env.test.ts
index 273bd86c..ecf1a9a5 100644
--- a/packages/core/src/restic/helpers/__tests__/build-env.test.ts
+++ b/packages/core/src/restic/helpers/__tests__/build-env.test.ts
@@ -318,6 +318,7 @@ describe("buildEnv", () => {
 			path: "/backups",
 			privateKey: PLAIN_PRIVATE_KEY,
 			skipHostKeyCheck: true as const,
+			allowLegacySshRsa: false as const,
 		});
 
 		test("throws for passphrase-protected private keys", async () => {
@@ -349,6 +350,20 @@ describe("buildEnv", () => {
 			expect(env._SFTP_SSH_ARGS).toContain("UserKnownHostsFile=/dev/null");
 		});
 
+		test("does not allow legacy RSA/SHA1 SSH algorithms by default", async () => {
+			const env = await buildEnvForTest(baseSftpConfig, "org-1");
+
+			expect(env._SFTP_SSH_ARGS).not.toContain("HostKeyAlgorithms=+ssh-rsa");
+			expect(env._SFTP_SSH_ARGS).not.toContain("PubkeyAcceptedAlgorithms=+ssh-rsa");
+		});
+
+		test("allows legacy RSA/SHA1 SSH algorithms after modern defaults when enabled", async () => {
+			const env = await buildEnvForTest({ ...baseSftpConfig, allowLegacySshRsa: true }, "org-1");
+
+			expect(env._SFTP_SSH_ARGS).toContain("HostKeyAlgorithms=+ssh-rsa");
+			expect(env._SFTP_SSH_ARGS).toContain("PubkeyAcceptedAlgorithms=+ssh-rsa");
+		});
+
 		test("uses StrictHostKeyChecking=yes when knownHosts is absent", async () => {
 			const env = await buildEnvForTest(
 				{ ...baseSftpConfig, skipHostKeyCheck: false, knownHosts: undefined },
diff --git a/packages/core/src/restic/helpers/build-env.ts b/packages/core/src/restic/helpers/build-env.ts
index 1f6df4ea..75b3af5c 100644
--- a/packages/core/src/restic/helpers/build-env.ts
+++ b/packages/core/src/restic/helpers/build-env.ts
@@ -153,6 +153,10 @@ export const buildEnv = async (
 					keyPath,
 				];
 
+				if (config.allowLegacySshRsa) {
+					sshArgs.push("-o", "HostKeyAlgorithms=+ssh-rsa", "-o", "PubkeyAcceptedAlgorithms=+ssh-rsa");
+				}
+
 				if (config.skipHostKeyCheck) {
 					sshArgs.push("-o", "StrictHostKeyChecking=no", "-o", "UserKnownHostsFile=/dev/null");
 				} else if (config.knownHosts) {
diff --git a/packages/core/src/restic/schemas.ts b/packages/core/src/restic/schemas.ts
index c38dfc1f..c56fbf34 100644
--- a/packages/core/src/restic/schemas.ts
+++ b/packages/core/src/restic/schemas.ts
@@ -118,6 +118,7 @@ export const sftpRepositoryConfigSchema = z
 		privateKey: z.string().min(1),
 		skipHostKeyCheck: z.boolean().default(false),
 		knownHosts: z.string().optional(),
+		allowLegacySshRsa: z.boolean().default(false),
 	})
 	.extend(baseRepositoryConfigSchema.shape);