At the end of September Microsoft launched the public beta program for Data Protection Manager (DPM) 2010 (codename Zinger).
More importantly, the product finally introduces the capability to backup virtual machines running on the Windows Server 2008 Cluster Shared Volumes (CSVs), a technology that is used to perform the VMs live migration with Hyper-V R2.
Without DPM 2010, and similar 3rd party solutions, the only way to backup Hyper-V virtual machines in CSVs is by running the backup agent inside the guest operating systems.
On top of that DPM 2010 introduces other virtualisation-friendly features, like the capability to restore virtual machines to an alternative host, or the capability to restore single items from within the VHDs.