April KB5083769 breaks third-party backup on Windows 11
⚠️ The April 2026 KB5083769 security update is causing third‑party backup applications to fail on Windows 11 (24H2 and 25H2) by triggering a VSS snapshot timeout. Vendors including Acronis, Macrium, NinjaOne and UrBackup have reported backup operations aborting with VSS timeout errors. Acronis has published guidance confirming failures on Pro and Home editions and recommends uninstalling KB5083769 and pausing updates as a temporary workaround.
