Connect iPad to your PC and your iPad content will be displayed. Open a library/playlist, and check the files you want to export.
Backup iPad to iTunes
Click "Export Checked Files to iTunes" button, then iTunes opens and the program starts exporting the files to iTunes. Now you can backup iPad files to iTunes.
Tip:You can also right click the checked files, and choose "Export to iTunes" option to start exporting the files to the folder you want.