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OS 10.11.6

I tried to partition an external HD (1) TB and after 3 hrs, I forced quit disk utility because the resizing just kept going.

I had divided it into 500gb each half. I highlighted the HD and under info, it shows that it had indeed been partitioned. I want (1) half for backup. Is it safe to try a backup? Never having used a partition for backing up, does superduper show which half you are backing up to? Looking at my desktop now shows another HD (untitled) which has 500gb available so I guess that should solve my query.

Any comments or advice anyone.

jaybass