If you are really afraid about losing your db, you can copy the Calibre library folder into your dropbox folder manually and then just open the new location in dropbox. That way you will have another backup copy and you can never have too many backups as far as I'm concerned. After you copy, open the library by choosing Switch/create library and search for the new dropbox library and "use the previously existing library at the new location". Just make sure you keep straight which library is which so you don't work in the wrong one - maybe give the new folder you copy to in dropbox a different name so you don't mix them up.
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