1. Run the Windows Backup Troubleshooter
Since this error is tied to the backup process, Windows has a built-in troubleshooter to fix backup-related issues:
- Go to Settings → Update & Security → Troubleshoot.
- Run the Windows Backup Troubleshooter and follow the instructions to resolve backup-related issues.
2. Check Volume Shadow Copy Service (VSS)
The error may be related to a malfunctioning Volume Shadow Copy service:
- Press Windows + R, type services.msc, and press Enter.
- Scroll down to Volume Shadow Copy, right-click, and select Restart.
- If it’s not enabled, right-click and choose Properties, then set it to Automatic and start the service.
3. Repair Corrupted PST Files
Corrupted data files can cause conflicts with the backup process:
- Close Outlook.
- Navigate to the ScanPST.exe tool (usually found in the Office installation folder).
- Run ScanPST.exe and repair the affected PST file.
4. Reconfigure Backup Settings
If you’re using Windows Backup or a third-party backup service:
- Check the settings for the backup service to ensure that it’s correctly configured and pointing to the right Outlook files.
- If using a third-party backup tool, verify its compatibility with your version of Outlook.
5. Reset Outlook Data Files
If the problem is ongoing, resetting your Outlook data files may help:
- Go to Control Panel → Mail → Show Profiles.
- Select Add to create a new profile.
- Set up your account again and check if the issue is resolved.
6. Run Outlook in Safe Mode
To see if third-party add-ins are causing the issue, try running Outlook in Safe Mode:
- Press Windows + R, type Outlook.exe /safe, and press Enter.
- If the error doesn’t appear in Safe Mode, disable any unnecessary add-ins.