I just want to clarify what was said. CCC or SuperDuper! will do a *smart copy* which means it will find new/changed files (since the last copy) and copy only those new/changed files to the 'master' backup. What it will NOT do is keep a series of copies over time (ala Time Machine). Each technique has it's own advantages and disadvantages. I usually have *both* a TM and SD copy made for any machine and data I care about.