I have three old computers that I have in storage in my attic. I've only kept them because all three have hard drives that still worked when I put them away and they have data on them I want. Mainly old pictures but there's some other data on there too that I want. I've been waiting on that proverbial 'round to-it' that never seems to come around.
My question is, what's the best way to get the data off of them? I'm not sure all of them would boot up. Should I remove the hard drives? How do you get power to them if you do? Is there an app somewhere that makes this easy peasy?

I also don't want to donate them or throw them away with potentially personal data on the hard drive so after I've done my thing getting the data off should I smash them or is just erasing the data good enough?

BKB