Cloud computing is an emerging trend in the technology side. With the development of networking and internet, the ability of technology to enable mankind to get access to any nook and corner of the world has seen greater heights. Clouds can store large amount of data without consuming ones real system space. But on the other side, the data stored in cloud must be preserved. There are many privacy preserving methods in the existing side to prevent the data in cloud. TPA's are also one such. This paper discusses the concepts of cloud and the methods to preserve the privacy of the data on cloud storage.