You can take a look at FFUpdater on F-Droid. There you can see different browsers for android and information about the features they have.

I’m useing mull.

As far as I know, you’ll have a last syched copy in your cache. Test it with no internet con! Try to export your data without internet.

I’m using vaultwarden for like 4 year now, but on my personal server at home. Btw a raspberry pi is enough to run vaultwarden.

You could take a look at reverse proxys and dyndns services (like duckdns -> free). I started like this. Now I have my own domain, but that is not mandatory!

So if I selfhost an instance the proxy setting still would hit my hosted ip?

I found it. It’s in the Account settings, under pin settings.