I have just used the XP pro back up utility to back up my 160GB raid 0 hard drive (2 x seagate barracuda`s 80GB) I stored the info on another 80 GB back up drive used in a removable caddy . Can anyone tell me seeing as though the microsoft web help pages are very vague about this topic exactly what i am backing up when i select "back up all information on this computer". Just what exactly am i backing up ? For example , lets just say my hard drive goes banzai and is not recoverable . Does this XP pro back up system allow me to buy a new hard drive , re-install windows XP pro and restore from the back up removable hard drive and be right back to where i left off before the hard drive crashed ??? If this is not the case as i suspect , is there such a program available that will be able to back up , and in the event of a hard drive failure restore the system to the exact state to where it was prior to the failure . Cheers , Steve , Plymouth UK