Cloning your disk to another connected to your Mac

Cloning your disk to another connected to your Mac Apps such as SuperDuper! and Carbon Copy Cloner let you mirror the contents of your internal disk to an external drive, and can set schedules so that this happens, say, daily at 3 a.m. so that it’s not getting in the way of your work. If your internal disk fails, you can just boot from the ex…