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    Remember: everything breaks, have a backup plan for when this YubiKey does.

    Can anyone elaborate on what they do as backup. I sometimes worry about this (use Yubikey for AWS console auth amonst other things).

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      Have a backup key that’s already associated with your important accounts, and store it in a safe place. Some services won’t let you assign more than one key to an account, and I think carefully about how important it is that I can get in if my key breaks.