I basically followed
this page...
Quote:
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To include your current calibre library in calibre portable just copy the entire contents of your current calibre library folder on your computer to the "Calibre Library" folder in the "Calibre Portable" folder on the USB stick.
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So via windows explorer I selected the content of my regular library, including a metadata and .json file, and copied that into the library folder thats created with the portable install.