HT201250 Can I back up using Time Machine if I have some files already on the ExHD, or do I need a clean ExHD to use Time Machine?

Can I back up using Time Machine if I have some files already on the ExHD, or do I need a clean ExHD to use Time Machine?

If you try to use a new disk with time machine, it will try to reformat your EXHD. so I would save the items on your EXHD before backing up with time machine or partitioning your EXHD in disk utility

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