CCC is the best thing to ever happen to Mac OS X - I used it to backup my 80 GB drive to my 200 GB drive. The 80 GB is only 25% full, so I can image it (running CCC FROM the 80 GB!) onto the 200 GB and have a ~20 GB .dmg, sitting there ready to go. Not only did I use this technique to move from my original 20 GB drive to a 40 GB then to the 80 GB - worked perfectly every time - but also to image the 80 GB, erase it completely, do a 10.3 clean install and then mount the old image and restore whatever I want. Just make sure you do a repair permissions after the restore.