@scarlettruin - if the modified date on the metadata.db file at Dropbox is April 2015, that suggests to me that it's a backup of your library as at that date. If you've subsequently added columns, changed metadata, and added books then they won't be there.
It's probably too late now, but, if you want to maintain an up-to-date backup at Dropbox, I would recommend you periodically (e.g. daily or at least weekly) update the backup (with calibre closed) with changes you've made to your live library using a file synchronising utility, once you have an created an initial copy there it wont take long to update it - typically a few minutes. And do the same with the configuration data, then you won't lose your settings, plugins etc.
Some people do maintain there live libraries on Dropbox, but as theducks pointed out it's not supported and fraught with dangers. It's my observation that the people who do keep there live libraries in the cloud tend to very computer literate.
BR
Last edited by BetterRed; 10-06-2016 at 10:31 PM.
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