slartabartfast
By their nature virtual machines add a layer of processing between the application and the OS. I can not see any reason to use a VM to run a DAW, and the decrease in processing speed might result in problems. Maybe a fast enough machine would be able to overcome that handicap, but why? If you want to back up, it makes more sense to use an imaging program and move the old system onto another drive/partition than to use a VM.
+1
I've never even attempted to set up a VM for this reason alone.
I have a dual boot setup for running legacy apps that I still like to use under XP and a W7 partition as my main boot partition. It takes roughly 10 minutes to image them both and about the same to restore either one and they are the actual OS's not virtual ones.
It's really simple to swap around OS's without having to resort to another layer of complexity.