> With Amazon (not sure about other providers), there's a risk of remote wipe. E-books are often not really yours, and DRM makes that doubly true. The risk of loss with e-books is significantly higher than with physical books.

You can mostly fix this with Calibre though (with DRM at the moment at least, it could always change). As I said in another thread, when I connect my Kindle it downloads all my new books and strips the DRM. And my Calibre library gets backed up.