This FAQ is very closel related to a previous FAQ of mine, SNMP Password Recovery.
It is valuable to have backup copies of your Cisco equipment configurations. Configurations often change over time and tracking these changes is often overlooked. How about automatically storing your network configurations? The quick and simple answer is, SNMP.
Using the MIB .184.108.40.206.220.127.116.11.1.55 you can write the config to a tftp server on your network.
for example, to write the configuration of a Cisco router or switch to a tftp server from an AIX host the command would be of form...
snmpset -c <cmmty name> <hostname of device> .18.104.22.168.22.214.171.124.1.55.<ip address of tftp server> octetstring <filename>