I have 2 machines, both basically the same 2Ghz CPU's, 2gb of ram, 240 gb HD. one runs win XP the other is win 7 the backup device is a WD Passport usb 2.0 ext HD. Win XP backs up 60 gb in approx. 2 1/2 hrs. the same size back up on Win 7 takes over 8 hrs. can anyone tell me why? and is there anything that can be done about it?