no backup button when there are some backups but some are missing

[tomholub]

Missing backup button, even though it says keys missing backup. In this situation, it should be showing backup button.

user can be reached at https://mail.google.com/mail/u/8/#search/pass+phrase+is%3Ainbox/FMfcgxwHNgfqvmrtVsLzDFFJRvZBTCpp

[tomholub]

this looks to be dependent on #2482 to be done first