If you build up enough referrals with Dropbox you can get more space, and I personally find the calibre2opds to be very useful. I'm pretty sure only Dropbox so far organizes things so the catalog's relative links remain valid, and if you're just backing up your library (and sharing it between different computers' instances of calibre) you probably don't care, but if you want to download individual books, like on a tablet, then it would be much easier like this.
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