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OS 10.12.6

I know this has been posted before, but I just backed up my HD using superduper and it took over 4 hours. (382 gbs) I notice that it said that it would completely erase my external HD and then copy. I don't remember it working that way before. It used to be that if you used the free copy, it did take a long time. What has changed?

I read that CCC is being preferred by some because of the copying time.

jaybass