D-Link ShareCenter DNS-315 User Manual page 189

Click Applications, Local Backup, USB Backups. Click Browse
under Destination. Find the volume you want to backup to
and click Save Settings. All files in this volume now supports
MTP.
Under USB Backups click the Enable radio button. Under
Category, select your USB backup format, USB to NAS or
NAS to USB.
Browse for your source.
D-Link ShareCenter DNS-315 User Manual 184