Not different at all as it is also just an evolvement of technology - you can get from point A to point B with the horse and buggy just like you can with a car - just not as conveniently or safely.
I also never said a backup computer is a necessity. I've merely provided perspectives on where it is is beneficial and why I carry one. Since you are obviously against a back up computer, how about providing us with some good reasons as to why a backup DC is a bad idea or creates issues? That way people can weigh both sides and make their own decision!