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Windows File History Backup Feature Broken by September Security Updates

Guavy AI Editorial Team Published September 21, 2026

Instruments

MSFT

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

File History, which was introduced in Windows 8 and replaced by Windows Backup, automatically saves copies of files to allow users to recover accidentally deleted or damaged files using an older version from hours, days, or weeks ago.

Affected customers may see application crash events in Event Viewer referencing FileHistory.exe and KERNELBASE.dll after installing the updates.

The affected devices will display 'Reconnect your drive' messages even when compatible backup drives are connected and working properly.

The Wire

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