Backing up Hyper-V virtual machines

You can use Wbadmin.exe (the command-line version of Windows Server Backup) running on the host to back up virtual machines on the host. This will work with the Volume Shadow Copy Service (VSS) provided you first register Hyper-V as an application for Windows Server Backup. You can do this as follows:

  1. Open Regedit on the host and navigate to HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion
  2. Create a new registry key named WindowsServerBackup
  3. Create a new registry key under the WindowsServerBackup key named Application Support
  4. Create a new registry key under the Under the Application Support key named {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}
  5. Now select the {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE} key and create a new REG_SZ registry value with the name Application Identifier and assign it a value data of Hyper-V.

Note that {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE} is the GUID for the Microsoft Hyper-V VSS writer.

For more details concerning this, see the blog post from AskCore in the Tech Briefing section of this newsletter.

Note however that Windows Server Backup can’t back up CSV volumes.

The above tip was previously published in an issue of WServerNews, a weekly newsletter from TechGenix that focuses on the administration, management and security of the Windows Server platform in particular and cloud solutions in general. Subscribe to WServerNews today by going to and join almost 100,000 other IT professionals around the world who read our newsletter!

Mitch Tulloch is an eleven-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows Server and cloud computing technologies.  Mitch is also Senior Editor of WServerNews. For more information about him see

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