As for passwords, well, I wont talk about that. It’s not good but still not worst practices at least.

Paper notebook? ;)

My Bitwarden and Proton Pass also require Yubikey to be present when logging in on a new device.

By “same platform” do you mean keeping them in the same app or the same system (e.g., my Android smartphone)? I used to use Authy, but after I bought the paid subscription for Bitwarden I moved my TOTP codes there (and later to Proton Pass) because it was so convenient.

Thanks for telling me about Betterbird. I see I can run it at the same time as Thunderbird which naturally fits my workflow described above 😅

I am thinking of self-hosting some stuff right now, but that’s mainy OneDrive/Google Drive replacement and Google Photos replacement. I could maybe self-host Bitwarden, too. Email? Nope. I know there’s A LOT of work with that, with the domains (so my emails don’t get rejected by other parties), with spam filters and so on. I will leave that to the professionals, it’s too important. File storage is for me, but email is for communication with others. So congratulations if you got that working :)