Great topic! I think a lot of us are hosting things without even realising!
I used to have a full desktop server running my home media. As you can imagine it took a lot of power and was total overkill for home use.
Now I have downsized to the following:
ZimaBoard 432 - OPNsense and Zenarmour (with ubiquity wireless AP
ZimaBoard 832 - CasaOS - Sonarr, Radarr, Prowlarr, Transmission, Jellyfin, Folding@Home, Klipper (3d printer control)
ZimaBoard 832 - TrueNAS (Backups)
Total peak use 27w.
All stacked on my HackerRack
https://www.printables.com/model/482719-hackerrack
Moving forward I would like to get a few more devices into a cluster and run my folding project purely on that possibly looking a kubernetes cluster… who knows!!