Well - yeah everybody back-up your files. And then back-up your back-ups.
But he's pissed because he lost his personal files in a crash? Does he honestly think that Barnes and Noble is keeping a back-up of his personal documents? If so, he's an idiot.
Could you imagine that absolute outrage that would rain down on any of these retailers if it was discovered they were grabbing copies of personal documents off of the reading devices and storing them on their servers? That would be a massive invasion of privacy.