Redundancy for maxed out 4404

Hello,
We currently have a 4404 controller that is approaching 100 AP’s (their max). The boss would like to add redundancy into the project. Which leaves me with a lot of questions and I am fairly new to cisco WLAN controllers.
While a second 4404 would cover for redundancy would that be true if the AP’s pass the 100 mark?
If I get a bigger controller that can support more than 100 (5508?)can the existing 4404 still work in the plan as a backup?
Or do I just need to purchase two bigger units and auction off the 4404?
Sorry if this is a dupe post but my searches are sending me in circles without an real answers and the boss would like an answer soon.
Thanks in advance,
Todd

While a second 4404 would cover for redundancy would that be true if the AP’s pass the 100 mark?
This line of questioning is going to start becoming very common because the Cisco has announced the End-of-Sale (EoS) of the 4400.
Personally, the 5508 has a faster CPU. Cisco claims that the inter-controller roaming of the 4400 is 18ms but the 5500 is 9ms. Big improvement.
If I get a bigger controller that can support more than 100 (5508?)can the existing 4404 still work in the plan as a backup?That's a perfect line of thinking. To answer your question: YES. Get the 5508 and move all your APs to the 5508 as the primary and leaving the 4400 as a backup.Or do I just need to purchase two bigger units and auction off the 4404?
You got the funds? Excellent. Then use the 4400 as a lab. Or you can auction it. Whatever floats your boat. By the way, if you have wireless in your house, put it in there. *wink!*

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