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File-level backup VSS Provider error on Hyper-V VMs moved to VMware


Upon attempting to perform an agent based backup of a server that had been previously moved from Hyper-V to VMware, the following error is encountered.

(VSS_E_UNEXPECTED_PROVIDER_ERROR) The shadow copy provider had an unexpected error while trying to process the specified operation.


In many cases, VMs that are moved from Hyper-V still have the Hyper-V IC VSS provider loaded which no longer functions when running on VMware.

You can confirm this by running the command "vssadmin list providers" and observing the following in the output:

Provider name: 'Hyper-V IC Software Shadow Copy Provider'
  Provider type: Software
  Provider Id: {74600e39-7dc5-4567-a03b-f091d6c7b092}


Remove the incompatible provider registry key that no longer functions and restart the Volume Shadow Copy service.

Before making any changes to the registry, it is highly recommended that a backup of the registry is performed 

1. Open a command prompt as an Administrator.

2. Backup the registry using the following command:

reg export HKLM\System\ControlSet001\Services\VSS\Providers C:\Windows\Temp\VSS_Providers.reg

3. Identify the Provider ID that needs to be removed from the output of the "vssadmin list providers". 

In the following example, the Provider ID we need is {74600e39-7dc5-4567-a03b-f091d6c7b092} which may be different on your system.

C:\Windows\system32>vssadmin list providers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2013 Microsoft Corp.

Provider name: 'Hyper-V IC Software Shadow Copy Provider'
  Provider type: Software
  Provider Id: {74600e39-7dc5-4567-a03b-f091d6c7b092}

Provider name: 'Microsoft File Share Shadow Copy provider'
Provider type: Fileshare
Provider Id: {89300202-3cec-4981-9171-19f59559e0f2}

Provider name: 'Microsoft Software Shadow Copy provider 1.0'
Provider type: System
Provider Id: {b5946137-7b9f-4925-af80-51abd60b20d5}

4. Remove the registry key using the following command being sure to substitute the example Provider ID with the one you have identified:

reg delete HKLM\System\ControlSet001\Services\VSS\Providers\{74600e39-7dc5-4567-a03b-f091d6c7b092}

5. Restart the Volume Shadow Copy (VSS) service apply the change using the following command:

net stop vss & net start vss

6. Re-attempt the backup.

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