E.g., with 1Password you can only setup regular “old” TOTP as an alternative and therefore backup (note you can use your Yubikey for both U2F and TOTP and other things too - this is where people get confused). RE: backup, yes, ideally you want to always register two but that’s not always possible.
Others e.g., 1Password don’t (you can only register one).
Yep, some sites/services e.g., Google allow you register multiple security keys (for use with U2F).
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