Which files folders are needed in order to restore a full operational copy of a VM? Just the .PVS and .HDD files? Anything else? In addition to making backups, I would like to keep a sort of "base" install of Windows that I could use to quickly branch out different environments (for example, one with SP2, one without, one with IE 5.5, one with IE6....etc). Can I just copy and rename an existing VM to create a duplicate?