I have a nifty little cron job setup at my house. I use a pi zero to send a wake on lan to all other cpus every week. Five minutes after boot, each cpu has a cronjob to update, upgrade, and then shutdown. When you have more than a few computers, it saves a bit of time to do shit like that.

I also use them for nightly backups (rsync) for my office cpu and the mirrors of my and my wife's phones.