Usage of Multi-user Environment services leaves traces of the client data on different servers (passwords, keys etc.). Since, most of the cloud servers use virtualization technology, it is difficult to find the co-resident virtual machine attacks in the private and public cloud systems. This was the great risk for the client accessing the multi-user environment services, with the leakage of their confidential information. So several memory reconstruction mechanisms are their by examine those mechanisms and develop a mechanism to only authorized person can access the confidential data. This paper introduces an overview of cloud data replication issues, data security issues and cloud attacks in the multi-user cloud computing environment. Hence, It is necessary to decrease the server maintenance cost by migrating the cloud userís sensitive data in a secured framework for future reference.
Security, Customer, Provider, Multi-User Environment, Data Remainance.