We've had a really weird week with our Windows 2003 servers, two of them seem to have forgotten about the domains they're supposed to belong to. They seem unable to authenticate against the domain controllers and when looking at share permissions all the local permissions resolve to names whereas all the domain permissions appear as a bunch of numbers separated by hyphens. I'm told by our IT department that only cure is a rebuild, rather harsh, but who am I to argue. Which brings me to the question......

Can any of you guys recommend a good cloning tool? I'd like to avoid any future fsckups by taking snapshots of all of my windows machines (Windows 2000/XP/2003) while they're working, so I can restore them sharpish in the event of a problem.