Adam Williamson wrote:
Also, these days, most authenticator apps support some kind of
backup
mechanism. FreeOTP lets you back up to a file (which you should, of
course, keep somewhere safe and ideally encrypted). Google
Authenticator can backup To The Cloud.
If you use Keysmith, you can just SFTP your
~/.config/org.kde.keysmith/Keysmith.conf from/to all your GNU/Linux
computers including the PinePhone or equivalent, and they will all be able
to generate the same TOTP keys with the same master key.
Kevin Kofler