SuperDuper
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Full user review
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"It works as advertised. Fast and effective."
Pros
After your first back up, it clones your drive in about 15% of the time than Retrospect does. I have tested the cloned drive and it works. I have used the cloned drive to migrate data from one Mac to another and it works.
Cons
It seems to take a long time from the time when the program is finished and you click on the "OK" button. Clearly there is a process running in the background but I can't tell what it is. This is a minor issue at most.
Summary
This is the clone utility to use if you want a fast, accurate and operational duplicate of your boot drive. I absolutely rely on it.