I've backing up (finally) my 2TB external hard drive that contains all my photography, iTunes, iTunes Lossless, books and Video files. It's about 1.2TB worth of data. I started the backup process on a fresh external around 9:30pm last night and today, around 2pm, it's only 50% complete. What's taking so long? I could have drag and drop faster than this. I'm not running a checksum or anything like that. I believe CCC is setup to only backup files that have changed after this initial first backup. What is it doing? FYI: My main external drive "Media HD" is on FW800 and my backup drive "Archive HD" is a USB 2.0. These are simply "media content" files, no OS X or system files on my internal drive inside my iMac.