Another vote for SuperDuper! I have used both, but just "trust" SD! more for some reason. It always seemed to me that CCC copied files unnecessarily, and sometimes produced unbootable clones. It also scared me how the author claimed from the beginning that CCC was compatible with Leopard, but the SD! developer wouldn't release a Leopard version until he KNEW it was right. I guess I just have far more faith in the SD! developer. And the paid version of SD! has more features than CCC as well, and to me they are well worth the small price asked.