D-Link DNS-320L User Manual page 93

Section 4 - Configuration
Once the encryption process has been completed, click Exit to close the
wizard and return to main Volume Encryption window.
You can also click Download Encrypted Key File to save the encryption key
to your local computer.
If you choose to save the encryption key file, a 'Save File' dialog will appear in
your web browser. Follow the instructions to save the file to your computer.
D-Link ShareCenter DNS-320L User Manual 87