diff --git a/app/client/modules/backups/components/schedule-summary.tsx b/app/client/modules/backups/components/schedule-summary.tsx
index f978d3c3..58cb3ad6 100644
--- a/app/client/modules/backups/components/schedule-summary.tsx
+++ b/app/client/modules/backups/components/schedule-summary.tsx
@@ -20,6 +20,7 @@ import { toast } from "sonner";
 import { handleRepositoryError } from "~/client/lib/errors";
 import { formatShortDateTime, formatTimeAgo } from "~/client/lib/datetime";
 import { Link } from "@tanstack/react-router";
+import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "~/client/components/ui/collapsible";
 
 type Props = {
 	schedule: BackupSchedule;
@@ -89,6 +90,11 @@ export const ScheduleSummary = (props: Props) => {
 		handleStopBackup();
 	};
 
+	const backupDetails =
+		schedule.lastBackupStatus === "warning"
+			? (schedule.lastBackupError ?? "Last backup completed with warnings. Check your container logs for more details.")
+			: schedule.lastBackupError;
+
 	return (
 		<div className="space-y-4">
 			<Card className="@container">
@@ -198,22 +204,24 @@ export const ScheduleSummary = (props: Props) => {
 						</p>
 					</div>
 
-					{schedule.lastBackupStatus === "warning" && (
+					{backupDetails && (schedule.lastBackupStatus === "warning" || schedule.lastBackupStatus === "error") && (
 						<div className="@medium:col-span-2 @wide:col-span-4">
-							<p className="text-xs uppercase text-muted-foreground">Warning Details</p>
-							<p className="font-mono text-sm text-yellow-600 whitespace-pre-wrap wrap-break-word">
-								{schedule.lastBackupError ??
-									"Last backup completed with warnings. Check your container logs for more details."}
-							</p>
-						</div>
-					)}
-
-					{schedule.lastBackupError && schedule.lastBackupStatus === "error" && (
-						<div className="@medium:col-span-2 @wide:col-span-4">
-							<p className="text-xs uppercase text-muted-foreground">Error details</p>
-							<p className="font-mono text-sm text-red-600 whitespace-pre-wrap wrap-break-word">
-								{schedule.lastBackupError}
-							</p>
+							<Collapsible className="border border-border/50 rounded-lg overflow-hidden">
+								<CollapsibleTrigger className="w-full p-3 hover:bg-muted/50 transition-colors">
+									<span>{schedule.lastBackupStatus === "warning" ? "Warning details" : "Error details"}</span>
+								</CollapsibleTrigger>
+								<CollapsibleContent className="border-t border-border/50 bg-muted/30">
+									<div className="p-3">
+										<p
+											className={`font-mono text-sm whitespace-pre-wrap wrap-break-word ${
+												schedule.lastBackupStatus === "warning" ? "text-yellow-600" : "text-red-600"
+											}`}
+										>
+											{backupDetails}
+										</p>
+									</div>
+								</CollapsibleContent>
+							</Collapsible>
 						</div>
 					)}
 				</CardContent>
diff --git a/app/server/modules/backups/__tests__/backups.execution.test.ts b/app/server/modules/backups/__tests__/backups.execution.test.ts
index fb563469..8d83436e 100644
--- a/app/server/modules/backups/__tests__/backups.execution.test.ts
+++ b/app/server/modules/backups/__tests__/backups.execution.test.ts
@@ -10,6 +10,7 @@ import { generateBackupOutput } from "~/test/helpers/restic";
 import { TEST_ORG_ID } from "~/test/helpers/organization";
 import * as context from "~/server/core/request-context";
 import * as spawnModule from "@zerobyte/core/node";
+import type { SafeSpawnParams } from "@zerobyte/core/node";
 import { restic } from "~/server/core/restic";
 import { NotFoundError, BadRequestError } from "http-errors-enhanced";
 import { scheduleQueries } from "../backups.queries";
@@ -148,6 +149,32 @@ describe("backup execution - validation failures", () => {
 });
 
 describe("stop backup", () => {
+	test("should keep restic warning details when backup completes with read errors", async () => {
+		const { resticBackupMock } = setup();
+		const volume = await createTestVolume();
+		const repository = await createTestRepository();
+		const schedule = await createTestBackupSchedule({
+			volumeId: volume.id,
+			repositoryId: repository.id,
+		});
+
+		resticBackupMock.mockImplementationOnce((params: SafeSpawnParams) => {
+			params.onStderr?.("error: open /mnt/data/private.db: permission denied");
+
+			return Promise.resolve({
+				exitCode: 3,
+				summary: generateBackupOutput(),
+				error: "Warning: at least one source file could not be read",
+			});
+		});
+
+		await backupsExecutionService.executeBackup(schedule.id);
+
+		const updatedSchedule = await backupsService.getScheduleById(schedule.id);
+		expect(updatedSchedule.lastBackupStatus).toBe("warning");
+		expect(updatedSchedule.lastBackupError).toBe("error: open /mnt/data/private.db: permission denied");
+	});
+
 	test("should stop a running backup", async () => {
 		// arrange
 		const { resticBackupMock } = setup();
diff --git a/app/server/modules/backups/backups.execution.ts b/app/server/modules/backups/backups.execution.ts
index e9389334..f446514a 100644
--- a/app/server/modules/backups/backups.execution.ts
+++ b/app/server/modules/backups/backups.execution.ts
@@ -149,6 +149,7 @@ const finalizeSuccessfulBackup = async (
 	scheduleId: number,
 	exitCode: number,
 	result: ResticBackupOutputDto | null,
+	warningDetails: string | null,
 ) => {
 	const finalStatus = exitCode === 0 ? "success" : "warning";
 
@@ -174,7 +175,7 @@ const finalizeSuccessfulBackup = async (
 	await scheduleQueries.updateStatus(scheduleId, ctx.organizationId, {
 		lastBackupAt: Date.now(),
 		lastBackupStatus: finalStatus,
-		lastBackupError: null,
+		lastBackupError: finalStatus === "warning" ? warningDetails : null,
 		nextBackupAt,
 	});
 
@@ -285,7 +286,13 @@ const executeBackup = async (scheduleId: number, manual = false): Promise<void>
 
 	try {
 		const backupResult = await runBackupOperation(ctx, abortController.signal);
-		await finalizeSuccessfulBackup(ctx, scheduleId, backupResult.exitCode, backupResult.result);
+		await finalizeSuccessfulBackup(
+			ctx,
+			scheduleId,
+			backupResult.exitCode,
+			backupResult.result,
+			backupResult.warningDetails,
+		);
 	} catch (error) {
 		await handleBackupFailure(scheduleId, ctx.organizationId, error, ctx);
 	} finally {
diff --git a/packages/core/src/restic/commands/backup.ts b/packages/core/src/restic/commands/backup.ts
index aa27aa98..b0022db8 100644
--- a/packages/core/src/restic/commands/backup.ts
+++ b/packages/core/src/restic/commands/backup.ts
@@ -101,6 +101,7 @@ export const backup = async (
 	const logData = throttle((data: string) => {
 		logger.info(data.trim());
 	}, 5000);
+	const stderrLines: string[] = [];
 
 	const streamProgress = throttle((data: string) => {
 		if (options.onProgress) {
@@ -134,6 +135,13 @@ export const backup = async (
 				streamProgress(data);
 			}
 		},
+		onStderr: (error) => {
+			const line = error.trim();
+			if (line.length > 0) {
+				stderrLines.push(line);
+				logger.error(`restic stderr: ${line}`);
+			}
+		},
 	});
 
 	if (includeFile) {
@@ -146,7 +154,7 @@ export const backup = async (
 
 	if (options.signal?.aborted) {
 		logger.warn("Restic backup was aborted by signal.");
-		return { result: null, exitCode: res.exitCode };
+		return { result: null, exitCode: res.exitCode, warningDetails: null };
 	}
 
 	if (res.exitCode === 3) {
@@ -174,8 +182,16 @@ export const backup = async (
 
 	if (!result.success) {
 		logger.error(`Restic backup output validation failed: ${result.error.message}`);
-		return { result: null, exitCode: res.exitCode };
+		return {
+			result: null,
+			exitCode: res.exitCode,
+			warningDetails: stderrLines.length > 0 ? stderrLines.join("\n") : null,
+		};
 	}
 
-	return { result: result.data, exitCode: res.exitCode };
+	return {
+		result: result.data,
+		exitCode: res.exitCode,
+		warningDetails: stderrLines.length > 0 ? stderrLines.join("\n") : null,
+	};
 };