D-Link DNS-320L User Manual page 316

Section 4 - Configuration
The list is now displayed in the table.
When you have created a new backup, it will appear in the Archive section.
From here you can check which archives to include in the playback list on the
playback screen by adding or removing a check from the Playback List column.
If you want to delete the archive, click the trash can icon for the folder you want
to delete.
D-Link ShareCenter DNS-320L User Manual 310