RPi4 running DietPi, with a 1TB USB drive, all strapped to the back of the TV. Syncthing for backing up phone media, Hugo for my blog posts, HomeAssistant for my ZigBee devices, Jellyfin for my media stack which network mounts my Synology NAS (auto wake/suspend), Moonlight client to game in the living room with PlayStation six axis controller, private git. All reverse proxied behind a CG-NAT to a single public IP4 VM I pay maybe 10€ / year for.