I have no feelings one way or the other about Fastmail, but since the offer TOTP as an option why not just archive the TOTP secret somewhere safe and offline? P

I have no feelings one way or the other about Fastmail, but since the offer TOTP as an option why not just archive the TOTP secret somewhere safe and offline? Put it with important papers that you'd store in a safe deposit box, with a trusted family member, etc.