Cloud is big data tables distributed across geographic locations to ensure not only optimum uptime but optimum response time. If you just have a server farm in Dallas, TX, that's not a cloud, no matter how big your data tables are. But if you have them in every locale (not necessarily same city but local as far as bits go) to each office accessing it, and they all share/propagate data intelligently across the big tables, that's a better definition of a corporate cloud. It's just that this kind of architecture is difficult and expensive to do, so it's usually done by 3rd parties.
