37472: Acronis Backup: backup fails with 'The shadow copy provider had an unexpected error while trying to process the specified operation'

Symptoms

  1. You start a partition or disk backup with VSS-snapshot enabled;
  2. 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

Solution

Check Windows Application Logs.

More information

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

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