Microsoft Confirms September 2026 Windows Updates Break File History Backups

Key Takeaways

• Microsoft has acknowledged a flaw in Windows updates scheduled for September 2026 that will disrupt the File History backup feature.
• The issue specifically impacts users running Windows 10 and Windows 11.
• File History will cease to function correctly, leading to incomplete or failed backups.
• A fix is currently under development by Microsoft, but no release date has been provided.
• Users are advised to implement alternative backup solutions until a patch is available.

Microsoft Confirms Upcoming Windows Updates Will Disrupt File History

Microsoft has issued a confirmation regarding an impending issue with Windows updates slated for September 2026. These updates are set to cause a significant malfunction within the File History backup utility, a built-in feature designed to protect user data on Windows 10 and Windows 11 systems.

The tech giant’s acknowledgment comes with a warning that, once deployed, the updates will render File History ineffective. Users relying on this utility for data preservation may experience incomplete backups, data loss, or outright failure of the backup process, potentially leaving their critical files vulnerable.

Impact on Users and Data Integrity

The File History feature, accessible via Settings > Update & Security > Backup in Windows 10, or Settings > System > Storage > Advanced storage settings > Backup options in Windows 11, allows users to regularly save copies of their files to an external drive or network location. The upcoming disruption means that any backups scheduled or attempted after the September 2026 updates are applied will likely fail to capture the full scope of user data, undermining a crucial aspect of personal data security.

While Microsoft has not yet provided a specific CVE ID or a detailed technical explanation for the impending breakdown, the company has indicated that a resolution is in progress. However, no timeline has been given for the release of a corrective patch. This leaves a significant window of vulnerability for users who depend solely on File History for their backup strategy.

What You Should Do

• Implement Alternative Backup Solutions: Do not rely solely on File History. Immediately establish and verify an alternative backup strategy using third-party software or manual copy processes to safeguard your essential files.
• Verify Backup Integrity: Regardless of the method used, regularly test your backups by attempting to restore a sample of files. This ensures that the data is recoverable and not corrupted.
• Monitor Backup Status: For organizations, actively monitor the success or failure of endpoint backups. Configure alerts for stale backup timestamps and conduct periodic restoration drills.
• Stay Informed: Keep an eye on official Microsoft announcements for updates regarding the release of a fix for the File History issue.

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