I have my Calibre Library on my desktop and synced to both DropBox and Box. I haven't, as of yet, gone through and added all my Kindle ebooks that are stored at Amazon. It seems like a lot of work for not much, if any, return.
The initial backup to Dropbox or Box does take a while depending on the size of your library and the speed of your internet connection. I just synced to Box yesterday and it took a couple hours to upload the whole thing.
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