Buffalo TS-XL User Manual page 67

Navigate to Extensions/Time Machine and click Modify
Settings.
Enable Time Machine. For the Target Folder, choose the
folder you created for the backups. Click Save.
Enter the Mac's "Computer Name" (from its Sharing page) as
the Target Host Name. For the Target MAC address, enter
the Mac's Ethernet ID from Advanced Settings in its Network
Preferences page. See the next page for instructions on
finding the right values for these fields. Click Create when
done.