I imagine there’s a way of backing it up as well, that covers you from both angles. If your online wallet goes bye bye, you have the hardware wallet to restore it. If the hardware wallet fails, you have a copy backed up online. I.haven’t read everything about it, but their website probably has some form of a “vault” to keep your backup in. Or you could keep a copy in your own backup spot or both.
Better to have and not need, than to need and not have.😁