Two different things.
I believe every book amazon has in their database will never be lost, at least until WW3. They won't rot. They won't be eaten by worms. Acidic ink won't deteriorate the cellulose. We won't need to have gigantic buildings to house them all.
Meanwhile the world's cloud storage will continue to expand exponentially, and the vast databases of books will be duplicated over and over and over again.
Way better than what happened when the library of alexandria was razed and the intellectual progress of the human race was set back probably several centuries.
I'm bullish on the cloud, if you didn't notice. :)