I have an external hard drive and i am trying to erase it because its full so that i can continue to use it to back up  my iMac help

Hi Guys
Ok I have an external haddrive that is I guess full. Can I erase it so I can continue to use it for backing up my iMac?

The short answer is yes, but if its capacity is inadequate for the source volume's contents it will still be too small.

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