My main concern is getting access when the security key breaks or I lose it.
For this, it's imperative that there's either another way to get access or that I associate a 2nd security key with the service I need access to. Of course, it's possible that the 2nd key breaks or is lost.
At least with hard drives, it's common for two hard drives manufactures around the same time to fail around the same time, so I'd be concerned with the possibility of that happening with the two security keys as well.
For this, it's imperative that there's either another way to get access or that I associate a 2nd security key with the service I need access to. Of course, it's possible that the 2nd key breaks or is lost.
At least with hard drives, it's common for two hard drives manufactures around the same time to fail around the same time, so I'd be concerned with the possibility of that happening with the two security keys as well.