Can't speak for this thing specifically, but FIDO2 keys in general:
- Yes, you have everything you need on every major OS/browser
- These devices are zeroconf; resetting it actually kills a security feature (key use increments) aiming at cloned devices
- The ideal backup for this is to have a separate key, both authorized. They don't need to have the same material, in fact, cloning it would be considered a weakness (how do you know someone hasn't cloned it without your knowledge?)
- Yes, you have everything you need on every major OS/browser
- These devices are zeroconf; resetting it actually kills a security feature (key use increments) aiming at cloned devices
- The ideal backup for this is to have a separate key, both authorized. They don't need to have the same material, in fact, cloning it would be considered a weakness (how do you know someone hasn't cloned it without your knowledge?)