A bug in the Windows Sept patch Tuesday update may stop File History from working. But a new optional update fixes it.

Microsoft warned that the built-in File History backup feature in Windows may stop working on some systems after installing the September 2026 security updates.

Microsoft has issued a warning to Windows users who rely on the File History that the backup feature may not function after installing the September 2026 Windows security update. The problem affects ...

Windows users who rely on File History to back up and recover important files may bump into problems after installing the September security update. In its Knowledge Base support pages for the ...