Add GPS points without losing what is on the GPS

I'm trying to take some points from an older GPS and add them to a new GPS so that all of my points are on one GPS unit. I'm wondering how I can do that, and if I add points to my GPS unit, will it delete what's already on the GPS unit? It's important information (data sets) so I don't want to play around with it and mess it up. Thanks in advance!

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