[atmosx]

Is there any sort of backup in case it gets destroyed or lost? Can you clone it?

[tptacek]

The entire security model depends on the devices being uncloneable.

[noja]

But my security model does not allow putting myself in a position where I am stranded without my second factor (or doing huge amounts of work re-registering everything).

[tptacek]

That's why you set up backup factors.

It is for the same reason that services like Google Mail won't let you set up a U2F token without a backup factor.

[nobodyorother]

The only backup I know of is getting another key that you register in the same way as the first key.

Hopefully they don't both break at the same time.