HyperV and Windows Backup

There's a registry hack that will also enable windows backup...

From http://support.microsoft.com/kb/958662:

To register the Hyper-V VSS writer with Windows Server Backup, follow these steps:

1.    Click Start, click Run, type regedit, and then click OK.

2.    Locate the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\

Microsoft\Windows NT\CurrentVersion


3.    Right-click CurrentVersion, point to New, and then click Key.

4.    Type WindowsServerBackup, and then press ENTER.

5.    Right-click WindowsServerBackup, point to New, and then click Key.

6.    Type Application Support, and then press ENTER.

7.    Right-click Application Support, point to New, and then click Key.

8.    Type {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}, and then press ENTER.

9.    Right-click {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}, point to New, and then click String Value.

10.    Type Application Identifier, and then press ENTER.

11.    Right-click Application Identifier, and then click Modify.

12.    In the Value data box, type Hyper-V, and then click OK.

13.    On the File menu, click Exit.