I don't rely on the cloud for storage, I rely on it to "feed" my Fire. I would like to have all my books on the Amazon cloud, as then I wouldn't need to have my computer to send a book to the Fire. But since Amazon is in the business of selling books (with DRM intact), having 3000 books in their cloud, with nary a one having DRM, and perhaps having some trace of where it originally came from within the metadata, doesn't seem like a good idea.
I don't think Dropbox presents the same risk. But I would never rely just on the cloud for backup. I used to have all my books on Dropbox, but I ran out of space. Therefore, I am begging for people to sign up with Dropbox so I get more space (I now remember why I went in-house - I hate, hate, hate trolling for clients (or bites)). I have a local back-up of my entire computer, and a separate back-up of my Calibre library on two different hard drives. But this does me no good with the Fire, if I am sitting at work and want to read a book (of course, why should I be looking for a book to read, when I am supposed to be working, anyway!).
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