Authenticator App - Lemmy.one

What authenticator app do you use? How do you backup? Any open source self hosted options?

I use andOTP, but will soon be switching to Aegis as andOTP is no longer updated.
there's a fork of andOTP, theOTPPlus.
GitHub - helloworld1/FreeOTPPlus: Enhanced fork of FreeOTP-Android providing a feature-rich 2FA authenticator

Enhanced fork of FreeOTP-Android providing a feature-rich 2FA authenticator - helloworld1/FreeOTPPlus

GitHub
Interesting, thanks for letting me know!