diff --git a/app/server/utils/restic.test.ts b/app/server/utils/restic.test.ts
new file mode 100644
index 00000000..afb1364c
--- /dev/null
+++ b/app/server/utils/restic.test.ts
@@ -0,0 +1,106 @@
+import { describe, expect, test } from "bun:test";
+import { buildRepoUrl } from "./restic";
+
+describe("buildRepoUrl", () => {
+	describe("S3 backend", () => {
+		test("should build URL without trailing slash", () => {
+			const config = {
+				backend: "s3" as const,
+				endpoint: "https://s3.amazonaws.com",
+				bucket: "my-bucket",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:https://s3.amazonaws.com/my-bucket");
+		});
+
+		test("should trim trailing slash from endpoint", () => {
+			const config = {
+				backend: "s3" as const,
+				endpoint: "https://s3.xxxxxxxxx.net/",
+				bucket: "backup",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:https://s3.xxxxxxxxx.net/backup");
+		});
+
+		test("should trim trailing whitespace from endpoint", () => {
+			const config = {
+				backend: "s3" as const,
+				endpoint: "https://s3.amazonaws.com/  ",
+				bucket: "my-bucket",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:https://s3.amazonaws.com/my-bucket");
+		});
+
+		test("should trim leading and trailing whitespace from endpoint", () => {
+			const config = {
+				backend: "s3" as const,
+				endpoint: "  https://s3.amazonaws.com/  ",
+				bucket: "my-bucket",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:https://s3.amazonaws.com/my-bucket");
+		});
+	});
+
+	describe("R2 backend", () => {
+		test("should build URL without trailing slash", () => {
+			const config = {
+				backend: "r2" as const,
+				endpoint: "https://myaccount.r2.cloudflarestorage.com",
+				bucket: "my-bucket",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:myaccount.r2.cloudflarestorage.com/my-bucket");
+		});
+
+		test("should trim trailing slash from endpoint", () => {
+			const config = {
+				backend: "r2" as const,
+				endpoint: "https://myaccount.r2.cloudflarestorage.com/",
+				bucket: "backup",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:myaccount.r2.cloudflarestorage.com/backup");
+		});
+
+		test("should strip protocol and trailing slash", () => {
+			const config = {
+				backend: "r2" as const,
+				endpoint: "https://myaccount.r2.cloudflarestorage.com/",
+				bucket: "my-bucket",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:myaccount.r2.cloudflarestorage.com/my-bucket");
+		});
+
+		test("should trim whitespace and strip protocol", () => {
+			const config = {
+				backend: "r2" as const,
+				endpoint: "  https://myaccount.r2.cloudflarestorage.com/  ",
+				bucket: "my-bucket",
+				accessKeyId: "test",
+				secretAccessKey: "test",
+			};
+			expect(buildRepoUrl(config)).toBe("s3:myaccount.r2.cloudflarestorage.com/my-bucket");
+		});
+	});
+
+	describe("other backends", () => {
+		test("should build local repository URL", () => {
+			const config = {
+				backend: "local" as const,
+				path: "/path/to/repo",
+			};
+			expect(buildRepoUrl(config)).toBe("/path/to/repo");
+		});
+	});
+});
diff --git a/app/server/utils/restic.ts b/app/server/utils/restic.ts
index 5299b1a1..16a0de0f 100644
--- a/app/server/utils/restic.ts
+++ b/app/server/utils/restic.ts
@@ -43,10 +43,12 @@ export const buildRepoUrl = (config: RepositoryConfig): string => {
 	switch (config.backend) {
 		case "local":
 			return config.path;
-		case "s3":
-			return `s3:${config.endpoint}/${config.bucket}`;
+		case "s3": {
+			const endpoint = config.endpoint.trim().replace(/\/$/, "");
+			return `s3:${endpoint}/${config.bucket}`;
+		}
 		case "r2": {
-			const endpoint = config.endpoint.replace(/^https?:\/\//, "");
+			const endpoint = config.endpoint.trim().replace(/^https?:\/\//, "").replace(/\/$/, "");
 			return `s3:${endpoint}/${config.bucket}`;
 		}
 		case "gcs":