Buffalo TS-XL User Manual page 56

To save a configuration file with NS-SHFT, select the TeraStation
that you want to save the settings from the dropdown menu. Click
Save. You will have to enter the admin password for the chosen
TeraStation to continue.
You have the option of password protecting the configuration file.
To do so, enter a password and click Set. If you don't want to
password protect the configuration file, leave the password fields
blank and click Close.