I have a 5th. generation Airport extreme with the following configurations: It is connected to two airport express (upstairs and downstairs in my villa) for extending the range and also for playing music via Airplay. It is connected to 1 TB external hard disk which I use as Airport Disc to backup my Mac-Mini and Macbook. I share the Airport Disk with three members of my family. I have just bought a 6th Generation Airport Extreme which supports AC (my Linksys Router Model 6200 also supports AC) Let me know the easiest way I can replace my older Airport Extreme with the newer one without much problem.