>Most TOTP apps support backups/restores, which defeats this.
Citation needed?
Yubico authenticator doesn't (the secure enclave is the Yubikey).
I'd be very surprised if MS Authenticator and Authy (which I don't use but are the most popular apps that I know of) support such backups
Citation needed? Yubico authenticator doesn't (the secure enclave is the Yubikey). I'd be very surprised if MS Authenticator and Authy (which I don't use but are the most popular apps that I know of) support such backups