A Windows update may be stopping your PC backups without warning
Microsoft says some September 2026 Windows updates can stop File History, a built-in backup tool, from making new backups. This means people may think their files are being saved when their most recent backup has actually failed.
Who is at risk
Windows users who depend on File History to protect personal or work files are most at risk.
What to watch for
Check whether your backup shows a recent successful date, and watch for missing backup progress, failed backup messages, or unusually old backup copies.
What to do
Immediately confirm that your latest backup completed successfully and, if it did not, make a manual copy of important files to an external drive or cloud storage until Microsoft provides a fix.