So that’s all well in good what about Hyper-V? Hyper-V has support to VSS built in – so if your backup software is VSS enabled when you request a backup of a the physical (parent/host) server Hyper-V will forward those requests to each virtual machine (requires integration components and OS VSS support) then the guest will forward the request to any VSS aware application. In the end what you end up with is a back up of the parent/host will backup any virtual machines on that server and allow you to restore them individually or as a group.
-How to enable Windows Server Backup support for the Hyper-V VSS Writer Rob Hefner (Support Escalation Engineer for Hyper-V) wrote a great post on enabling support for the Hyper-V VSS writer for Windows Server Backup. This is a very helpful article! Make sure you have the “Windows Server Backup” feature enabled or you won’t be able to create the registry key…
-Backup and Recovery Overview - TechNet
-Step-by-Step Guide for Windows Server Backup in Windows Server 2008 – TechNet
Taylor Brown Hyper-V Integration Test Lead http://blogs.msdn.com/taylorb