What everyone said. I'll add that when you save downloads, save them to an organized directory structure. All my downloads to go into one folder: Downloads in MyDocuments. Within that folder are sub-folders for Poser, Bryce, etc. Within Download/Poser folder are sub-folders for Props, Vicky 3, Animals, etc. You can make your folder structure as complex or simple as your needs dictate. Backing off to CD is easy. Your Downloads folder :) After backup if you want to keep the stuff on your harddrive, move them over to an Archives folder with the same structure. And start over. Your stuff is organized from the beginning and you know what's backed up and what's not.