I save each OTP config on three separate Yubikeys using Yubico Authenticator. I also screen-shot the QR code and save that and any recovery codes to a veracrypt volume.
If the site allows for UTF I register each key for that too, but only if I can also use OTP since I can't yet use UTF with my android phone.
If the site allows for UTF I register each key for that too, but only if I can also use OTP since I can't yet use UTF with my android phone.