I'm definitely not a "typical" case, just saying what I did:

A friend of mine used discord for his worldbuilding project and at some point when I asked him sth and he emailed me a bunch of images and texts (I don't use discord anymore) I was like "yeah no this is enough I'm setting up a mediawiki for you"

I spent about a week figuring shit out with NixOS containers, keycloak and some mediawiki thingies (gosh the openid connect plugin is cursed), and now he's happily writing away at his wiki (when he feels like it lol).

I'm not saying to do it like me, it's probably the most monumentally worst way to do it, but it works well enough.

Yes: Bitwarden.

Idk about the central instance, but I use my bitwarden (specifically vaultwarden) instance for my TOTP keys. I can just autofill and then it copies the current TOTP key and i can paste it in to log into whatever i'm logging into!

I'm running a mumble and a conduit server currently, and I'm not planning to ever touch shitcord again ^^

A friend of mine talked about data preservation in the internet in a blog post, which I consider to be a good read. Sure, there's a lot lost, but as he sais in the blog post, that's mostly gonna be trash content, the good stuff is generally comparatively well archived as people care about it.

Something people seem to forget a lot when talking about these sorts of things is that there's multiple publishing and macroblogging fediverse servers...