My goal in buying this product was to be able to completely replace my hard drive's contents when I get infected with some little trojan, file system glitch, whatever. I've found it's so much more time effective to just rebuild. So if I have saved a good image from my computer when it's healthy, if I restore from that later, would that overwright the file system and any little trojan .dll's? I don't want/need to keep backing up or adding to that image. I'm very religious about backuping with ntbackup.