Just used the (iCloud - iPhone App) backup, great new option. It took me some time to realize that symbols (automatically included in the passwords generated by my pw manager) are not allowed in the password. The button to save the password remains greyed out then. Perhaps this can be explained in the text (or perhaps symbols can be allowed). Apart from that, it was a smooth experience.
We did the security analysis on the password using only alpha numerics, so that is what got into the ticket. It looks like Ben’s doc which says “it is secure with alphanumeric, 8 chars, and these argon2 settings” got interpreted as a maximum instead of a minimum.
We will enable passwords with symbols in the next update,