OK, I downloaded Super Duper. When I back stuff up, is it a good idea to use Super Duper and Time Machine just to make sure, or is that overkill?
Rita
I can second Jon's recommendation of SuperDuper!, even though CCC would work as well. SD, however is free, albeit without some features like scheduling, for which the shareware fee is necessary. But you don't need those paid features in normal use.
It is definitely a very good idea to use both Time Machine and something like SuperDuper.
Time Machine backs up on an hourly basis, where a clone copy is a back up of one particularly moment. After that moment passes and things change, where is the back up for that?
On the other hand, a clone copy gives you the ability to startup your computer in the event that your computer hard drive has issues.