As in this paper we have proposed a cloud data storage redefines the security issues and targeted on customer’s outsourced data (data that is not stored/retrieved from the costumers own servers). In this project we came to know, from a customer’s point of view, relying upon a solo Service Provider (SP) for his outsourced data is not very promising. In this we have proposed security as well as availability in this there are data divided into parts store on different providers the data which is divided is also store on backup servers so if the data could not get retrieve from main server can be retrieved from the backup server so it ensures availability and as data is divided into parts it is secured and whole data could not be changed or retrieved by someone else.