If you want to remove duplicate files like music, videos etc. from Samsung Kies, then follow these steps: remove duplicate files Samsung Kies

Kies for Mac®

Click the library you want to check for duplicate content, and click File. When duplicates are found, the option Show duplicate items will be available. Click Show duplicate items to display all possible duplicates in a list. To return to the normal view of your content, click File > Show all.

Kies for Windows®

Click the library you want to check for duplicate content, and click Kies Duplicates View Button. to switch to the duplicates view.  To return to the normal view of your content, click Kies List View to switch to list view.