It's not really your own cloud, just a centralised bunch of disks with a poor backup system. Getting your data from Amazon is easy, obviously, as that's the whole point. I've been using them for years and never had problems in that regard. Couple that with encryption, and you can take the benefits of Amazon's system (low cost, geographical spread, high availability, high speeds) without the down-sides. You can also couple Amazon's offerings with their virtual machines, something you can't do with your attempt of a cloud.