The term “cloud” is very common term and is used in both biological plus technical fields. During rainy reasons cloud plays a very important role in the life of human beings as it stores all molecules for showering the water and humans can preserve the water for future living. In the same way, in technical fields it offers a list of facilities for the user with respect to data such as data storage, security to data, data sharing, and data preservation for the future, updation and maintenance. Cloud is one such platform which allows the user to store the data and application together at one place and it is made available irrespective of the place of access at any time. Cloud can be used by an individual or a company for many purposes such as storing, retrieving and sharing documents, photos, e-mails, etc. The big question which always runs on every researcher’s mind is the need of cloud. The main problem is to find a place to store the huge growing amount of data. According to a survey done by Peter Lyman and HAL R Varian, world produces approximately two Exabyte’s of data every year which means that each individual contribution is around 250 megabytes. So it is possible to fit this much amount of data in any storage medium like papers, magnetic tapes, disks and drives. This paper gives a brief insight into the existing cloud storage techniques which are used by organizations.

IAAS, PAAS, SAAS, GDS-LC, SPMCloud, etc

[1]. Anthony V. Velte, Toby J. Velte, Robert Elsenpeter, “Cloud Computing-A Practical Approach”, McGraw-Hill Companies, in 2010.
[2]. Rajkumar Buyya, James Broberg, Andrzej Goscinski, “Cloud Computing-Principles and Paradigms”, John Wiley & Sons, in 2011.
[3]. Abhishek Parakh, Subhash Kak, “Online data storage using implicit security”, an Elsevier Article Published in May 2009.
[4]. Hongwei Li, Yuanshun Dai, Ling Tian and Haomiao Yang, “Identity-Based Authentication for Cloud Computing”, Springer- Verlag Berlin Heidelberg 2009.
[5]. Hao Jin, Ke Zhou, Hong Jiang, “Dynamic and Public Auditing with Fair Arbitration for Cloud Data”, an Article in IEEE Transactions on Cloud Computing, February 2016.
[6]. Swapnali More, Sangita Chaudhari, “Third Party Public Auditing Scheme for Cloud Storage”, an Article in Procedia Computer Science (Elsivier), December 2016.
[7]. Bibing Hou and Feng Chen, “GDS-LC: A Latency and Cost Aware Client Caching scheme for Cloud Storage”, ACM Transactions on Storage, November 2017.
[8]. Chuan Qin, Jingwei Li and Patrick P.C. Lee, “The Design and Implementation of a Rekeying Aware Encrypted Deduplication Storage System”, ACM Transactions on Storage, February 2017.
[9]. Michael Vrable, Stephen Savage, Geoffrey M. Voelker, “Cumulus: File System Backup to Cloud”, ACM Transactions on Storage, December 2009.
[10]. Alysson Bessani Miguel Correia, Bruno Quaresma, Fernando Andre and Paulo Sousa, “DEPSKY: Dependable and Secure Storage in a Cloud-of-Clouds”, ACM Transactions on Storage, December 2013.
[11]. Luis Angel, D. Bathen and Nikhil D. Dutt, “SPM Cloud: Towards the Single-Chip Embedded ScratchPad Memory-Based Storage Cloud”, ACM Transactions on Design Automation of electronic system, in June 2014.
[12]. Marcus Branden Burger, Christian Cachin and Nikola Knezevic, “Don’t trust the cloud, verify: Integrity and Consistency for object stores”, ACM Transactions on privacy and security, July 2017.
[13]. Hasan Mohamed Ibou, “OpenStack: The Cloud OS”, A Technical Report, October 2013.
[14]. Hui Tian , Yuxiang Chen , Chin-Chen Chang , Hong Jiang , Yongfeng Huang , Yonghong Chen , Jin Liu, “Dynamic-Hash-Table Based Public Auditing for Secure Cloud Storage”, IEEE Transactions on Services Computing, Volume: 10 , Issue: 5 , PP: 701-714,Sept.-2017.
[15]. Jia Yu , Kui Ren , Cong Wang , Vijay Varadharajan, “Enabling Cloud Storage Auditing With Key-Exposure Resistance”, IEEE Transactions on Information Forensics and Security, Volume: 10 , Issue: 6 , PP: 1167-1179, June 2015.
[16]. Bo Mao ; Hong Jiang , Suzhen Wu , Lei Tian, “Leveraging Data Deduplication to Improve the Performance of Primary Storage Systems in the Cloud”, IEEE Transactions on Computers , Volume: 65 , Issue: 6 , PP: 1775 – 1788, June,2016.
[17]. Lan Zhou , Vijay Varadharajan , K. Gopinath, “A Secure Role-Based Cloud Storage System For Encrypted Patient-Centric Health Records”, The Computer Journal ( Volume: 59 , Issue: 11 , Nov. 2016.