Is it anything like multi-threaded xz – in that you’re trading encoding speed for size?

For a large organization? Sure. For your family and friends? No.

There are lots of tutorials, and choosing a security-first OS is also wise… OpenBSD is my current favourite.

Honestly, building a mail server isn’t that hard if you aren’t afraid of the command line.

Precisely. Not sure why their example isn’t being replicated in every city and suburban town.

Why not just build tiny homes? Built to code, 200sqft, well insulated, power, running water, and phone/internet, close to public transit. A fixed address with access to a social worker and a nurse on site, and the ability to get back up on their feet.

The idea would be to give people something between ‘tent’ and ‘apartment’ as transitional housing. Nobody freezes to death, nobody gets caught in the rain and loses everything they own. A community centre for socializing / education / laundry / showers, etc. There’s a ton of unused / underutilized lots in most cities - buildings ready for demolition, behind on taxes, and better used to deal with the housing crisis.

This isn’t rocket surgery. Someone please take this idea and run with it!