When we restore VMs using DPM 2010 in the Network folder except VHD file we have snapshots AVHD files.
But, the issue here us that we cannot import all these VHD and AVHD files into the Hyper-V Windows Server 2008 R2 Server because configuration XML files are missing.
Only way to import restored VM machine is to do MERGE of all snapshots with its previous Parent snapshot and to the end with the Original Parent VHD file.
This merging can be done using Edit Disk in Hyper-V Manager.
Here is the explanation for Disk merging: