Are you serious? So long as it's not on fire, it's going to be fine. You're just using it as a backup on a computer. Not a server. Not some huge important set of data, like some financial or hospital database. By the time this backup of yours is even remotely in danger, it will have failed for other reasons, or it may be so far forward that the great apes and cats will have gone extinct, yet your drive lives on with old copies of tv shows you're backing up.