I'm not sure you can quantify the risk of loss with e-books being significantly higher than with physical books. There are a lot of house fires, any one of the

I'm not sure you can quantify the risk of loss with e-books being significantly higher than with physical books. There are a lot of house fires, any one of them could destroy your book collection (even the smoke damage alone can make then unusable) - same with floods, vandalism, etc. How many people have lost their e-book collection due to remote wipe? And if you're going to talk about the person who was wiped by Amazon, it's worth checking the conclusion of that story...