Before doing some work on a Hyper-V VM, I want to make sure I can reverse the change should something happens. I know this can be done with snapshot but I wonder if they are really worth it. The .AVHD file can occupy a significant amount of space and it won't give it back until the VM is restarted. Also, the merging process makes me nervous. Sometimes I find it easier to just shutdown the machine, copy the .VHD file, restart the VM, do the work on it and if nothing bad happens, I simply delete the copy after a few days. Am I causing an unnecessary headache by proceeding like this? The Hyper-V host runs on W2k8 R2.