This is probably simple but ... Using N360, Windows Vista and an external hard drive for back-up, I have an available back-up of ~250Gb and ~1.3Tb of total backup. Viewing the back-up folder it appears that there may be 16 different back-up sets (1-9, a-f). I tried "Deleting previously backed up files" as provided via the "Help" information but it indicated that only one back-up set was available. All I want to do is delete what I am presuming are older back-up sets that are just taking up space. I know that I could just delete 15/16 back-ups via Windows Explorer but I am not sure how that impacts links to Norton, etc. and am not really certain which back-up set would be the most current. I also seem to have the same situation on my hard drive, ~130 Gb available and ~430 Gb total so I would probably want to delete extra back-up sets there also. Is my thinking correct? How do I delete the unwanted back-ups?