I keep my photos backed up on two identical WD external USB hard drives. I'm looking for an affordable, easy to use software that will automaticly mirror those drives. I didn't like the Memo or WD utility that came with them. It would seem such a software should exist; is a simple concept after all. Copy files from a card to a HD, then at a preset time like 3am, the software will look for files on both hard drives and copy back and forth until they are identical. Suggestions?