Interesting - but not good enough. For the threat model TOTP solves, it is not absurd to want Authy-like functionality where codes can be backed up, encrypted,

Interesting - but not good enough. For the threat model TOTP solves, it is not absurd to want Authy-like functionality where codes can be backed up, encrypted, to a cloud service OR like Authone (?) which allows you to export the data to a file.