[svieira]

Yes, but in order to add new items to each piece of hardware you have to be physically co-located with all the pieces of hardware you want to use as your backups. Which means they cannot be geographically distributed (or if they are that there is a period of time in which you aren't fully backed up). Which means you're either in a place where you can loose all your keys (e. g. a house fire or a flood) or your in a place where you can loose all the devices that have a key.