If I have an older MacBook that I no longer use but that works great, and I have it reset to factory specs, then install a wallet on it, and use that computer as a "cold" wallet, with all wifi and wireless settings turned off, and only physically plug the laptop in when going online (20 minutes here and there) and unplugging it... could that be considered safe enough to be a secure place to store BTC or other crypto?
I would consider it safe enough, but it's not the ideal cold storage setup as soon as you connect to the internet even once.
I'm not talking about connecting to wifi now and then, I'm talking about ONLY plugging in the ethernet cable when going into the wallet and unplugging it when I'm finished. If I have the spare laptop (can't sell it, it has sentimental value but I have a newer, faster one I use daily) would the experienced on here say that's a secure way to store coins?
If all you do after formatting your laptop is install the wallet and transact from time to time, without never opening any website or downloading any software, it's way more secure than just storing your coins in your everyday laptop/PC.