[Purple Lady]

Originally Posted by Katsunami

I would retain a local copy also, if I were you. Dropbox wants to own your files, and they have been known to cancel accounts containing e-books.

To be honest, I would never trust a cloud service as my main storage.

Dropbox was only canceling accounts of those who made their opds catalog public and had copyrighted books. I don't remember if they only canceled if the drm was stripped. If your opds catalog is private you have nothing to worry about.