HT201250 If I have a Hard Drive with files already on it, will backing up my MacBook Pro delete the files already on the Hard Drive?

I have recently bought a Hard Drive to store files that can no longer fit on my MacBook Pro. I also want to use this Hard Drive as a back up for my entire computer. Will backing up my computer delete the files i already have on my Hard Drive??????

It shouldn't.
If you are planning to use Time Machine, then no, it will never overwrite files that aren't part of an old Time Machine backup; only old data put there by Time Machine will ever be touched by Time Machine.

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