For that one should have 2 devices, both registered to same service, and the second would act as backup. FIDO specifically argues against cloning device secrets.
Edit: discussed in: Backup / Restore U2F secret?
For that one should have 2 devices, both registered to same service, and the second would act as backup. FIDO specifically argues against cloning device secrets.
Edit: discussed in: Backup / Restore U2F secret?