Fix Windows Backup App Skipping Some Folders During Cloud Sync on Windows 11

You open the Windows Backup app on Windows 11 and notice that not all folders are syncing to OneDrive. Some folders show a sync pending status while others are skipped entirely. This problem usually occurs because the Windows Backup app relies on the OneDrive sync engine, which has folder-level exclusions or permission issues. This article explains why folders are skipped, provides step-by-step fixes to restore full cloud sync, and covers related failure patterns you might encounter.

Why Windows Backup Skips Folders During Cloud Sync

The Windows Backup app on Windows 11 uses the OneDrive sync engine to back up folders from your local PC to the cloud. When the sync engine encounters a folder that is excluded by OneDrive folder protection settings, has corrupted sync metadata, or lacks proper NTFS permissions, it marks that folder as skipped instead of syncing it. The root cause is almost always one of three things: the folder is not included in the “Back up these folders” list, the OneDrive sync database has a conflict or stale entry, or the folder contains file names or paths that exceed Windows path length limits. The fix requires you to re-add the folder, reset the OneDrive sync state, or adjust folder permissions.

Steps to Restore Full Folder Sync in Windows Backup

Follow these steps in order. Test after each step by opening the Windows Backup app and checking if the skipped folders appear in the backup status.

1. Open Windows Backup settings
   Press Windows + I to open Settings. Go to Accounts > Windows backup. Under Back up these folders, click Manage sync settings. This screen shows every folder currently selected for cloud backup.
2. Re-add the skipped folder
   If a folder is missing from the list, click Add a folder. Navigate to the folder location, select it, and click Choose this folder. The Windows Backup app will start syncing it. If the folder was already listed but marked as skipped, remove it by clicking the X next to the folder name, then add it again.
3. Verify OneDrive folder protection
   Right-click the OneDrive icon in the system tray and select Settings. Go to the Sync and backup tab. Under Back up important PC folders, check that Desktop, Documents, and Pictures are set to On. If you are trying to sync a custom folder outside these three, it must be added via the Windows Backup settings in step 2.
4. Reset the OneDrive sync engine
   Press Windows + R, type %localappdata%\Microsoft\OneDrive\onedrive.exe /reset, and press Enter. Wait for the command prompt window to close. This resets the OneDrive sync cache without deleting your files. After the reset, open OneDrive again by searching for OneDrive in the Start menu. Sign in if prompted and check Windows Backup again.
5. Check folder permissions
   Right-click the skipped folder and select Properties. Go to the Security tab. Under Group or user names, select your user account. Verify that Full control is set to Allow. If it is not, click Edit, select your user, check the Full control box, and click Apply. Then click OK.
6. Run the Windows Backup troubleshooter
   Open Settings > System > Troubleshoot > Other troubleshooters. Find Windows Backup and click Run. The troubleshooter will scan for common issues such as corrupted backup metadata or service misconfiguration. Follow the on-screen instructions.

If Windows Backup Still Skips Folders After the Main Fix

If the steps above do not resolve the issue, the problem may be caused by deeper sync conflicts or file system errors. The following sections describe additional failure patterns and their fixes.

Folder with a file name longer than 260 characters

OneDrive cannot sync files or folders whose full path exceeds 260 characters. To check, open the skipped folder in File Explorer and look at the address bar. If the path is long, rename the folder or move its contents to a shorter path. A quick test is to copy the folder to the root of the C drive and see if it syncs.

OneDrive free storage limit reached

When your OneDrive storage is full, the sync engine stops syncing new folders. Open onedrive.live.com in a browser and check your storage usage. If you are near the limit, delete files from the OneDrive recycle bin or upgrade your storage plan.

Windows Backup app shows “Paused” status

The backup app may pause sync if the system detects high CPU usage or battery saver mode. Open the Windows Backup app and look for a Paused banner. Click Resume to restart sync. Also check that Battery saver is not active under Settings > System > Power & battery.

Corrupted Windows Backup app package

If the app itself is corrupted, folders may be skipped without any sync error. Open PowerShell as administrator and run Get-AppxPackage WindowsBackup | Reset-AppxPackage. This command reinstalls the app package without affecting your backup data. Restart your PC after the command completes.

Windows Backup Folder Sync vs OneDrive Folder Protection

Item	Windows Backup Folder Sync	OneDrive Folder Protection
Purpose	Backs up selected folders to OneDrive via the Windows Backup app	Automatically syncs Desktop, Documents, and Pictures folders to OneDrive
Folder scope	Any folder on the local drive can be added	Limited to Desktop, Documents, and Pictures
Sync engine	Uses OneDrive sync engine under the hood	Uses the same OneDrive sync engine
Configuration location	Settings > Accounts > Windows backup	OneDrive Settings > Sync and backup tab
Common skip cause	Folder not added to the backup list or permissions issue	Folder protection turned off or storage full

You now know how to fix the Windows Backup app when it skips folders during cloud sync on Windows 11. Start by re-adding the missing folder in Settings and resetting the OneDrive sync engine. If the problem persists, check folder permissions and file path lengths. As an advanced tip, you can use the fsutil command in Command Prompt to check for file system errors on the drive that contains the skipped folder.