Microsoft Update Warning—Windows 11 Security Fix Breaks Backups

Microsoft’s April Windows 11 security update KB5083769 is breaking some third-party backup tools on 24H2 and 25H2 systems.

Affected vendors include Acronis, Macrium, NinjaOne, and UrBackup, with failures tied to Volume Shadow Copy Service timeouts.

Microsoft has not yet released a fix, and some users may need to remove the security update to restore reliable backups.