Symptoms
- 'File History has stopped' or a red error in Settings
- Backup drive fills up faster than expected
- Backup hasn't run in days despite being turned on
- Error mentions a specific file or folder it can't back up
Likely causes
- CommonBackup drive is full or nearly fullFile History needs free space to keep new versions.
- CommonBackup drive disconnected or renamedIf the drive letter or name changes, File History can lose track of it.
- PossibleA file or folder in the backup set is locked, corrupted, or has an invalid nameOne bad file can stall the whole backup job.
- PossibleFile History service stopped or disabledA Windows update or third-party tool can occasionally disable it.
What to do
- Check the backup drive's free space and delete old versions or move to a larger drive if it's full.
- Confirm the drive is properly connected and still shows the same name/letter File History expects.
- Open Settings > Update & Security > Backup and check for a specific error message.
- Try excluding a suspect folder temporarily to see if backups resume, which points to a problem file.
- Check that the File History service is running via the Services app (services.msc).
- Turn File History off and back on, pointing it to the same drive, if the configuration seems corrupted.
When to call a pro
If backups keep failing and you can't isolate the cause, a technician can review the backup configuration and drive health together.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.