What’s the currently best way to manage TOTP tokens?

Hey!

I basically want to replace the Google Authenticator app in style and functionality:

1. List all TOTP tokens and their validity time (with a name and order I decide).
2. Allow me to periodically or on change back up the whole thing to some off-site storage, keeping the last N backups.
3. Have a native app for Android or an actually good PWA.
4. Don’t do magic bullshit like fetching icons, hide tokens, etc.
5. Be actually secure (i.e. don’t roll your own auth)
6. Just be a TOTP manager, and nothing more! No, I’m not interested in a password manager, thank you. I also don’t want any other OTP methods I don’t use.
7. Don’t be a one-man projects where the availability is not clear in >1 year.

Any experience is welcomed. Thank you!

Edit: Thanks for all the great ideas, I just set up 2FAuth which seems to be the most minimalist and single-feature thing to self-host. I’ll evaluate how it performs but keep a backup in Google Authenticator. It does not match #7 but it seems to be actively used by the author and gets constant updates and fixes, so it’s most likely fine, I guess.

There is a 3rd-party app for it, but this app seems to be pretty much dead (last release in July 2025 and not in any app store) – or at least not released anymore but still worked on but only in the repository.