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Is that for something like a backup of the data? If not, you probably want to be copying it from the "assets" (if by that you mean the read-only installation folder where the code and such reside), to the "appdata" folder, which is the app-specific read/write folder where all data should be kept unless it's in a fairly general format which other apps could read, e.g. .doc or .jpg files.
The app that I'm working on has to have the ability of merging the data with a desktop database. The easiest way to accomplish this is to have the database stored in the user document directory on the Playbook that can be accessed when the Playbook is plugged in via USB from the desktop app.
