A lot of it simply building in redundancy, it has little to do directly with the cloud. And yes, redundancy is always costly, especially if done right. You ju

A lot of it simply building in redundancy, it has little to do directly with the cloud. And yes, redundancy is always costly, especially if done right. You just need to decide whether your business plan will benefit from it, and what parts are necessary. The rest of it is making sure your app or site fails gracefully; that is that failure of one part doesn't bring down the whole. That can be expensive to retrofit, but actually should have been designed in from the beginning, as it is a generally accepted part of good design for anything running over a network.