Windows 11’s April update is now breaking third-party backup apps
Windows 11's April 2026 update, KB5083769, is causing third-party backup applications like Acronis, Macrium Reflect, and UrBackup Server to fail due to a bug in the Volume Shadow Copy Service. The issue prevents proper backup functionality and has left users unable to rely on their backup software. Microsoft has not yet released a fix, and affected users are advised to uninstall the update for now.
- ▪The KB5083769 update causes failures in backup apps including Acronis, Macrium Reflect, NinjaOne Backup, and UrBackup Server.
- ▪Problems stem from a bug in the Volume Shadow Copy Service (VSS) and also include BitLocker lockouts and boot loops.
- ▪Users are advised to uninstall KB5083769 until Microsoft releases a patch.
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News Windows 11’s April update is now breaking third-party backup apps Windows 11 update KB5083769 is causing software failures with several backup programs. Microsoft hasn't released a fix yet. By Mikael Markander Contributor, PCWorld May 1, 2026 9:16 am PDT Image: ChatGPT Summary created by Smart Answers AIIn summary:PCWorld reports that Microsoft’s Windows 11 update KB5083769 is causing widespread compatibility issues with popular third-party backup applications including Acronis, Macrium Reflect, and UrBackup Server.The problems appear to stem from a bug in the Volume Shadow Copy Service that prevents backup software from functioning properly alongside other issues like BitLocker lockouts.Users experiencing backup failures are advised to uninstall the problematic update to restore…
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