Archival storage is one idea, for it minimises DNA's disadvantages-which are that, compared with hard drives, reading and writing it is fiddly and slow.
RAM, super simple, first hard drive, super simple, but, to get to that main hard drive, you have to take the Mac Mini entirely apart which is a little more challenging than I anticipated.
Yeah, I could barely get it started using the safe mode, but when the computer was connected to the internet, its hard disk roared a harsh rasping sound. After a while, it crashed into a coma.