Cisco Dial NMS Implementation Manual page 123

Having quick access to archived configuration files reduces network downtime when problems occur.
You can only back up managed devices.
To back up the Cisco IOS start-up configuration files for devices within the network, follow these steps:
From the Tasks menu, select Device Configuration: Update Archive.
Select All Devices.
Select one or more devices from the list that appears.
Click Finish.
The Cisco IOS start-up configuration file is copied from the router to the Unix workstation.