> How on earth are the big players introducing this when we can't even back up the keys?

> Another things is I "lost access" to passkeys.io while trying out passkeys. My phones Bluetooth was switched off, and by the time my phone created and saved a passkey, it timed out on the computer. So now I can't login with that passkey and it only fails. Seems like I'm locked out now...

What does "backing up" the key achieve over and above just registering another key?

Hey, quick note from the creator of passkeys.io: You can always enter your email address on the login screen and this will initiate a fallback auth flow via email passcode.