Hardware wallets like a Ledger allow you only once, on initialization, to backup the initial random seed to paper in the form of 24 english words via the BIP39

Hardware wallets like a Ledger allow you only once, on initialization, to backup the initial random seed to paper in the form of 24 english words via the BIP39 standard. You can use this seed by hand or on a duplicate device to deterministically recreate all keys be they webauthn, pgp, bitcoin, or otherwise.