diff --git a/app/server/modules/backups/__tests__/backups.patterns.test.ts b/app/server/modules/backups/__tests__/backups.patterns.test.ts
new file mode 100644
index 00000000..9753efcf
--- /dev/null
+++ b/app/server/modules/backups/__tests__/backups.patterns.test.ts
@@ -0,0 +1,135 @@
+import { test, describe, mock, expect, beforeEach } from "bun:test";
+import { backupsService } from "../backups.service";
+import { createTestVolume } from "~/test/helpers/volume";
+import { createTestBackupSchedule } from "~/test/helpers/backup";
+import { createTestRepository } from "~/test/helpers/repository";
+import { generateBackupOutput } from "~/test/helpers/restic";
+import { getVolumePath } from "../../volumes/helpers";
+import path from "node:path";
+
+const backupMock = mock(() => Promise.resolve({ exitCode: 0, result: generateBackupOutput() }));
+
+mock.module("~/server/utils/restic", () => ({
+	restic: {
+		backup: backupMock,
+		forget: mock(() => Promise.resolve()),
+	},
+}));
+
+beforeEach(() => {
+	backupMock.mockClear();
+});
+
+describe("executeBackup - include / exclude patterns", () => {
+	test("should correctly build include and exclude patterns by joining with volume path", async () => {
+		// arrange
+		const volume = await createTestVolume();
+		const repository = await createTestRepository();
+		const schedule = await createTestBackupSchedule({
+			volumeId: volume.id,
+			repositoryId: repository.id,
+			includePatterns: ["include1", "subdir/include2"],
+			excludePatterns: ["exclude1", "subdir/exclude2"],
+			excludeIfPresent: [".nobackup"],
+		});
+
+		// act
+		await backupsService.executeBackup(schedule.id);
+
+		// assert
+		const volumePath = getVolumePath(volume);
+
+		expect(backupMock).toHaveBeenCalledWith(
+			expect.anything(),
+			volumePath,
+			expect.objectContaining({
+				include: [path.join(volumePath, "include1"), path.join(volumePath, "subdir/include2")],
+				exclude: [path.join(volumePath, "exclude1"), path.join(volumePath, "subdir/exclude2")],
+				excludeIfPresent: [".nobackup"],
+			}),
+		);
+	});
+
+	test("should not join with volume path if pattern already starts with it", async () => {
+		// arrange
+		const volume = await createTestVolume();
+		const volumePath = getVolumePath(volume);
+		const repository = await createTestRepository();
+
+		const alreadyJoinedInclude = path.join(volumePath, "already/joined");
+		const alreadyJoinedExclude = path.join(volumePath, "already/excluded");
+
+		const schedule = await createTestBackupSchedule({
+			volumeId: volume.id,
+			repositoryId: repository.id,
+			includePatterns: [alreadyJoinedInclude],
+			excludePatterns: [alreadyJoinedExclude],
+		});
+
+		// act
+		await backupsService.executeBackup(schedule.id);
+
+		// assert
+		expect(backupMock).toHaveBeenCalledWith(
+			expect.anything(),
+			volumePath,
+			expect.objectContaining({
+				include: [alreadyJoinedInclude],
+				exclude: [alreadyJoinedExclude],
+			}),
+		);
+	});
+
+	test("should correctly mix relative and absolute patterns", async () => {
+		// arrange
+		const volume = await createTestVolume();
+		const volumePath = getVolumePath(volume);
+		const repository = await createTestRepository();
+
+		const alreadyJoinedInclude = path.join(volumePath, "already/joined");
+		const relativeInclude = "relative/include";
+
+		const schedule = await createTestBackupSchedule({
+			volumeId: volume.id,
+			repositoryId: repository.id,
+			includePatterns: [alreadyJoinedInclude, relativeInclude],
+		});
+
+		// act
+		await backupsService.executeBackup(schedule.id);
+
+		// assert
+		expect(backupMock).toHaveBeenCalledWith(
+			expect.anything(),
+			volumePath,
+			expect.objectContaining({
+				include: [alreadyJoinedInclude, path.join(volumePath, relativeInclude)],
+			}),
+		);
+	});
+
+	test("should handle empty include and exclude patterns", async () => {
+		// arrange
+		const volume = await createTestVolume();
+		const repository = await createTestRepository();
+		const schedule = await createTestBackupSchedule({
+			volumeId: volume.id,
+			repositoryId: repository.id,
+			includePatterns: [],
+			excludePatterns: [],
+		});
+
+		// act
+		await backupsService.executeBackup(schedule.id);
+
+		// assert
+		expect(backupMock).toHaveBeenCalledWith(
+			expect.anything(),
+			getVolumePath(volume),
+			expect.not.objectContaining({
+				include: expect.anything(),
+				exclude: expect.anything(),
+			}),
+		);
+	});
+});