- You start a partition or disk backup with VSS-snapshot enabled;
- Backup fails with one of these messages:
The shadow copy provider had an unexpected error while trying to process the specified operation.
The request is not supported
Check Windows Application Logs.
Troubleshoot VSS-related issues with the free Acronis VSS Doctor tool.
See also Microsoft: Creating protection for Hyper-V VMs on Windows Server 2012 fails with Internal error code 0x809909E2
Microsoft: Error events are generated when you try to perform a system state backup on a Windows Server 2003-based computer