My point is that a caching server is a resource like any other. Adding additional backend capacity, and adding additional caching capacity are both "adding reso

My point is that a caching server is a resource like any other. Adding additional backend capacity, and adding additional caching capacity are both "adding resources"/"scaling up". Doing smart things to do more with the same resources, do the same with fewer resources, or by replacing expensive resources with cheaper resources, is optimization, not scaling. We're being really pedantic right now, though. :)