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Surely this method is quite costly?

I have a fairly large 25GB free dropbox but that certainly isn't enough to put a dent in my 250GB lightroom files plus the 300GB from 2011/2012.
 
The article describes syncing the library, not the actual image files.

It's actually pretty funny. The author suggests saving your image files to an external HDD -- which is the same place you can save the library, making it kind of pointless. (though another option is to rely on the editable previews coming up in LR5)
 
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