Even a dual core pentium is a supercomputer by 80s standards, that's THE way to look at it
- insert one(1) hdd and use as a backup target (you should have multiple, so it doesn't matter if this one fails eventually)
- fuck the web, embrace the internet: FTP, SMTP, NNTP, IRC and so on, all work without requiring many resources
- you can host a mail server with ipv6 right from your living room. Pro tip: sending mail is difficult, but receiving mails on mythrowaway@homeserver.funny doesn't require any precautions)
- set up FTP (with explicit encryption, so FTPES) and never need a cloud drive service again)
- run several screen sessions with IRC (irssi), torrent (rtorrent seeding Linux .isos)
- register for one or more pubnix servers (tildeverse.org), run a script with cron that checks for interesting new stuff on them, show in your MOTD which servers have updates so you don't have to check them manually
- install newsboat and check all your RSS feeds
- install a newsreader and help revive USENET with a free account from literally anywhere