D-Link ShareCenter DNS-320L User Manual page 280

Section 4 - Configuration
Under Create New Backup, you can enter the name for the backup Folder
in the field provided, and click the Browse button to select a Destination
path. The Select Path window will open.
If you do not have a folder for backup, click the + sign to create a new
folder. Type a new folder name then click OK to continue.
Select a path on the NAS where you want the backup to reside. Click Apply.
D-Link ShareCenter DNS-320L User Manual 274