When I back up two computers (imac 24" & MBP 13") will the data be sorted separately? So i could back up my imac, and only see my stuff from the imac or will I see all data from both computers? and same for MBP, will I see my data I backed up from my iMac? If so, is there a way to stop this? *other then backing up only one computer* thxs.