I'm trying to setup a test lab that mimics production as close as possible. I have a root and a child domain with many 2003 DC's in each one. I'm considering adding a 2003 VM DC to production, then backing up the system state on it and restoring to a hyper-V isolated guest. Has anyone done this before or may have a better suggestion? I don't care to test everything, my main concern is to be able to add a 2012 DC to the root domain and promote it.