Thse sample PowerShell scripts can be used to enable Hyper-V auto-protection in DPM 2010
In any virtualized environment, adding new VMs is a frequent operation. While backup administrators can protect an entire Hyper-V host using the DPM Management Console, the protection group had to be modified manually to include the new virtual machines that have come up on the Hyper-V host. These scripts are expected to work with DPM 2010 Beta. By using them, you should be able to quickly put together a script that can enable the auto protection of your hyper-v hosts. Note: These scripts work on an existing protection group and do not create a fresh protection group. The attached scripts automate the task of adding any new virtual machines recognized in the Hyper-V hosts protected by the DPM server into existing protection groups. There are different scripts for Hyper-V clusters (AddNewClusteredVM.ps1) and standalone Hyper-V hosts (AddNewStandAloneVM.ps1). You would still use the script for standalone servers to automatically protect the non-clustered virtual machines of any Hyper-V host that is part of a cluster.
You can download the script from: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=46d51b5a-5827-43f6-84f5-ce33f4a8e6c3