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					Originally Posted by cybmole  interesting - so you put the app data folders for various apps into drop box. is that as well as or instead of having them in the usual windows locations ? | 
	
 I have previously installed calibre in my Dropbox but I ran into minor things with file registration and context menus in Windows explorer (not with running calibre) so now I only have my configuration folder and library in my Dropbox.
I do run my 
portable apps from my Dropbox.  That way my Firefox browser has the same history and bookmarks on all my machines.  It also allows a nice set of open source applications to be available at all of my machines.
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					Originally Posted by cybmole  do you have your whole calibre library in drop box or just your preferences ? | 
	
 I have my library and my preferences in Dropbox.
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					Originally Posted by cybmole  what happens if dropbox servers are down - do your apps still work ? | 
	
 Dropbox just syncs/backs up data within the Dropbox folder.  The files are all run from folders local to your machine.  If I go from Computer A to Computer B and the Dropbox servers are down (hasn't happened in over a year) the program will run fine.  
The problem would be if Computer B was off while you updated things on Computer A, when you turn on Computer B you need to wait for Dropbox on Computer B to sync with the cloud before starting calibre.  If you don't wait for it to sync, the work/changes done on Computer A might not show up properly on Computer B.
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					Originally Posted by cybmole  it seems to be a neat Idea, but I think I'm, more comfortable with a designated master version + a backup on my other PC, then I manually use shareware synchromagic software to update the backup, as needed | 
	
 You should always use what you're comfort level allows.  Even if you use Dropbox you still need a good backup plan for catastrophic loss.  Even if you choose to use the method above Dropbox might be a nice way of syncing your two configuration folders.