If you are backing up Windows Server 2008 Hyper-V Virtual Machines using Volume Shadow Copy Service then you should check out a new hotfix. It rectifies 3 issues:
Issue 1
If you back up a Hyper-V virtual machine that has multiple volumes, the backup may fail. If you check the VMMS event log after the backup failure occurs, the following event is logged:
Log Name: Microsoft-Windows-Hyper-V-VMMS-Admin
Source: Microsoft-Windows-Hyper-V-VMMS
Event ID: 10104
Level: Error
Description:
Failed to revert to VSS snapshot on one or more virtual hard disks of the virtual machine ‘%1’. (Virtual machine ID %2)
Issue 2
The Microsoft Hyper-V VSS Writer may enter an unstable state if a backup of the Hyper-V virtual machine fails. If you run the vssadmin list writers command, the Microsoft Hyper-V VSS Writer is not listed. To return the Microsoft Hyper-V VSS Writer to a stable state, the Hyper-V Virtual Machine Management service must be restarted.
Issue 3
You cannot restore a Hyper-V virtual machine if the virtual machine was configured to use a legacy network adapter.