Ivan Pepelnjak wrote an excellent article on using the IOS configuration archive for automated config backups:http://www.nil.com/ipcorner/RouterConfigArch/
Sounds like you have a trunking config problem on your WLC. What VLANs are being used, what does the switch interface config look like and how are the WLC interfaces configured?
In a nutshell, GET provides a scalable tunnel-less transport for unicast/multicast traffic. I highly recommend you review all the Cisco docs on the subject and there are quite a few.Cisco did a GET presentation at the DFW Users group a while back, i...