Very little. I have enough redundancy through regular snapshots and offsite backups that I'm confident enough to let Watchtower auto-update most of my containers once a week - the exceptions being pihole and Home Assistant. Pihole gets very few updates anyway, and I tend to skip the mid-month Home Assistant updates so that's just a once a month thing to check for breaking changes before pushing the button.
Meanwhile my servers' host OSes are stable LTS distros that require very little maintenance in and of themselves.
Ultimately I like to tinker, but once I'm done tinkering I want things to just work with very little input from me.
I just recently put in an N100 mini PC to run as a Plex server. Cost me about £160, pulls all of 6W when idle, and it doesn't break a sweat when transcoding no matter what I throw at it. As a media server I can't recommend them highly enough.