Quote:
Originally Posted by eschwartz
I'll side with the OP on this. 
Dropbox is perfectly safe. As long as you pause Dropbox while calibre is running.
Additionally, make sure to sync Dropbox before and after running calibre, to make sure Dropbox won't get confused when two computers try to update the same file -- this assumes you run calibre with the Dropboxed library on two computers. |
That's a big caveat, though. Forget to pause it and you could find yourself up the proverbial creek. It's far safer (IMHO) to simply store a copy of your library in Dropbox, and use a sync tool to manually sync that copy with your live library.