I back up my computer using Time Machine every few weeks. I've realized, though, that during every backup, nearly 5GB is copied. Now I know that I don't download that much in a few weeks. I was wondering--is there a chance that Time Machine is copying something over and over...and over again? I have checked off the "Time Machine Backups" "Downloads" and "Movies" folders to NOT back up onto my external HD. Is there any way to see what exactly those 5GB are composed of? Any way to see what the additions are?