It just works, there’s no “how”. Take one of the devices outside, connect to the internet, done.

Yes

There’s a torrent on TPB as well as a 280GB of this stuff on archive.org

Yeah, it’s absolutely the same. I hope you’ll experience it one day.

No, it’s called a ration stamp

What if a country has money but you also need monthly issued talons to get most goods?

Unless you live a very dynamic lifestyle that requires your calendar to be 24/7 synced, you can just use whatever server software you like, make it listen in LAN only, and have your devices sync when they’re at home.

DecSyncCC and Syncthing is another option.