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Also, where do I store the backup Yubikey, or any other pass key owning device for that matter? It has to be easily accessible to set up the pass keys, but also safe from accidents like house fire.

There's a strange tension where I want to use pass keys because they are easy to use but also they are easy to lose, so I choose a KeePass synced over cloud and deal with a bit of a hassle by having to copy/paste my passwords.

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I think technically you can just register the public key of the passkey and only need it on-hand for login
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Technically i would think so too, but is that how it's implemented? (I legit don't know, but my feeling was always that you had to add them while they're present, especially as there's different passkeys for different sites, to do it offline do you pregenerate 100 keys for each device to assign later?)
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