To archive the good ones, because you are correct. Modern stuff is mostly just crap.

NP, you have to do it on the web interface, not in the app. You can also decrease the frequency if you don’t want it to last forever.

Netbird, it doesn’t use much for data for me, just disable expiry and it’ll stay connected. I would guess the third party app is part of the problem.

Bookstack in a docker container. You can export pages with revision numbers and dates. I print out the emergency stuff and keep it in a binder. https://www.bookstackapp.com/ I’ve been using it at work for like a decade now. No apps or anything though, just a decent web interface.