will buy this when new version is released(vista). But i have a few questions before. here goes i have a 200GB H/D and an External H/D 250GB. two partitions of C:drive 39GB(used 29GB) windows/few software. D: drive 34GB(used 27GB) software. the rest of my HD is for data(not interested in them) so what i am wanting is two snapshots 1 with my current system i have now ie windows xp pro and then another which i create a blank snapshot with vista on. so i can go from one to another because as we all know vista is not perfect at the moment. my question is if i create the blank snapshot with vista on what space does it take up? do i have enough on the c/d drives? or do you backup the snapshots to an external drive first then do a blank one? i can not get my head around all this thanks looks good software reading this forum.