Traditionally big storage arrays are an expensive thing to build. Enterprise grade expandable SAN solutions are very expensive to buy and even more expensive to operate. Alternatively, you could rely on open source solutions and build the SAN yourself with a lot of manual labour and an unclear outcome. Both approaches have their pitfalls.
Sometimes it makes sense to put all your data into the cloud. In fact, for many purposes that is the ideal solution, since you not only get geologically distributed redundant copies of your data, but also a very fast backbone to your data - all for a price that is truly competitive.
CloudAngels can help you decide which data to move into the cloud and how to best make use of it, while maintaining strict privacy standards.