I agree those are useful. But consider they are also hard(er) to do with paper books. Pack a paper book up in a box; write an address label; hike down to the Post office?<p>And backup? What does that even mean for a paper book? Photocopy? EBooks are in the cloud; you can never actually lose one forever. Just buy it again, which is very, very likely to be cheaper than photocopying a paper book.<p>Just saying.