Drag & drop from the device to the location I'd have thought would be easiest. If those folders are empty, then fill them back up. You can double-check looking at LW's library window to see which folders are shared. So open up the Shared folder, drag & drop files from the device mounted on desktop across. Else copy/cut & paste across. LW would need to be restarted to see such files.

Did you only back up your shared files?