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Where are my collected data stored?
They are stored in 'ScrapBook' directory in your profile folder. The file named 'scrapbook.rdf' is a XML/RDF that manages tree structure of your collection, and each items you collected are in 'data' directory.

I don't want to store collected data in my profile folder. I want to change the destination to store data.
First, move entire 'ScrapBook' folder to your favorite location. Then go to [Tools] > [Settings] > [Advanced], configure the [Destination to Store Data].