You can always save to disk your library and copy those files to DropBox or do a one-way sync of your library to DropBox when calibre is not running. This discussion seems to be about wanting to use a cloud service to hold the working copy of your library which neither the creators of SQLite or calibre recommend.
To paraphrase the quote I posted in a message above, it'll work until it unexpectedly breaks. That seems to match the number of posts on MobileRead that (again paraphrased) read "I've used my calibre library on <cloud service/NAS/whatever> for years and now calibre says my library is corrupt or can't be opened or whatever other error has happened. HELP!!!"
As for setting up the content server to be accessed outside your local network? That was an easy-peasy task though perhaps decades of working with networks helps there. Compared to the sheer joy of microsegmenting the datacentre and WAN networks to control east-west traffic while allowing the systems to work, it was trivial to allow external secure access to a calibre content server.
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