Hyper-V and DPM – snapshot problem

PiotrIr

Could you advice me please? I have DPM 2007 and take host based backup of virtual machines. After couple of months and installing patches I have got it finally running without crashing servers.
However I noticed that DPM create local (on disk where virtual machine is stored) snapshot which I’m not able to see on Hyper-V management console. My problem is that snapshot growth very fast and now on one HDD I’m almost out of space (93% used).
My questions are:
1. How can I merge snapshots to VM – is it enough to shut down it?
2. How to avoid problems like that in future
3. What will happen when snapshot will reach whole space on the disk?
4. And finally how does it work. Will it growth for ever or just change after every backup?

Could you advice me please? It is kind of urgent as I’m not quite sure if after next backup my MV will work.