At my company we are backing up about 150 Hyper-v VMs in an Hyper-v cluster using CSVs (Windows 2008 R2).
The space used by these VMs is about 18TB on SAN storage and 1GB network.
We are using DPM 2010 to backup the VMs from the Cluster NODEs (6 of them) to our DPM storage SAN. Also using the Software VSS driver rather than the Hardware one and so backing up 6 VMs (1 per node) at a time.
Once the full backup has finished the Express Full typically takes about 14 hours each day to run. i.e. just backing up what has changed during the day.
Does this seems right? Can we speed this up in any way? Would 'Compress on the Wire' help? (I'm not sure how to find out the rate of change but its not going to be much more than 500GB a day)
When the backup is running we are not seems any slowness on anything or any servers working under any real load.