Manjaro Linux with ZFS on some old gaming PC.
Home Automation and IoT with HomeAssistant in a virtual box. Database for storing some IoT history (not hooked up to Home Assistant yet but recording from MQTT) with MariaDB. Media Server with Emby. Photograph Backups with Immich; just playing with this for now. Constantly have problems running it to do with not connecting to Redis or PostGres :/ MQTT Server with Mosquitto for some custom IoT devices. VPN with WireGuard. File Syncronization with Syncthing; to/from phone and other computers. Torrenting with Deluge and Deluge Web.
That email seems more thought out than anything he has said to the public...