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You would be better to just partition the external into 3 and roll through them in order using erase in Superduper on the oldest.
SD remembers which drive you backed up to last so you just go to the next one. ) call them One Two and Three.
I do that with two partitions Odd/Even and then have a third backup once a month that is away from the computer on a dedicated drive.
SD remembers which drive you backed up to last so you just go to the next one. ) call them One Two and Three.
I do that with two partitions Odd/Even and then have a third backup once a month that is away from the computer on a dedicated drive.