Hyper-V Backup tip

KB article 958662 explains how to user Windows Server Backup, the new backup software included with Windows Server 2008 and Windows Server 2008 R2, to backup up Hyper-V virtual machines. The article walks you through creating a new Registry value to enable support for the Volume Shadow Copy Service (VSS) provider for Hyper-V. I have put together a command line that does it for you, just copy, paste and run it on your server.

reg add “HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWindowsServerBackupApplication Support{66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}” /v “Application Identifier” /d Hyper-V /t REG_SZ

To verify that the key was created successfully you can use vssadmin.exe:

vssadmin.exe list writers

If everything is in order the result will include an entry for the Microsoft Hyper-V VSS Writer:

Writer name: ‘Microsoft Hyper-V VSS Writer’
Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
Writer Instance Id: {f3358397-0e40-4c97-b845-d9ec930740e6}
State: [1] Stable
Last error: No error

Notice the Writer Id for the provider, which is identical to the one created in the Registry.

More info:

  • KB958662: How to back up Hyper-V virtual machines from the parent partition on a Windows Server 2008-based computer by using Windows Server Backup
  • Vssadmin

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