You can either
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Use the export function to move it to a backup location, which is what I suggest you do because the export function will add the metadata to the files. You should be able to select more than one album at a time and export, although, I would suggest doing it in small 10 CD groupings, and add a “Backed Up” Tag, so you can know which ones you have backed up.
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You can go to the shared network location on the Nucleus and copy using the file manager of another PC. However, this will not get you the meta data and the files you move will look like:
