Re: Google Authenticator, I've started grabbing the TOTP secrets and storing those in backups. Download the QR code and decode it to get a string like the following:
That "secret" field is the only thing that TOTP actually cares about, and any app that supports TOTP will happily ingest the secret and provide 2FA codes.
otpauth://totp/Domain%3Ayour%40email.com?secret=HXDMVJECJJWSRB3H&issuer=Domain
That "secret" field is the only thing that TOTP actually cares about, and any app that supports TOTP will happily ingest the secret and provide 2FA codes.