I have about 200 CDs and DVDs and I am guessing that there are another 8-10gig on my machine that I need to backup. these are just from my D100's (one got stolen). Overall that totals somewhere near 18,000 taken since December 2003. If you add the previous 2 digital cameras, that would be another 15,000 - 20,000 images. (actually killed the Olympus. Wore it out) Those are backedup on another 200 discs. That would be all since August 2000 when I got my first digital.