Windows 11 KB Update Triggers Backup Failures Due to VSS Timeouts
The April 2026 KB5083769 security update for Windows 11 24H2/25H2 breaks several third‑party backup apps that rely on Volume Shadow Copy Service (VSS), causing backup operations to fail with a VSS timeout; affected vendors include Acronis, Macrium, NinjaOne Backup, and UrBackup. Acronis confirms the impact on Windows 11 Pro/Home and recommends uninstalling the update and pausing updates as a workaround. Microsoft also issued out‑of‑band fixes for related server issues earlier in the month, and some Windows Server 2025 devices may receive BitLocker recovery prompts after KB5082063.