When backing up a large number of computer systems to many different storage devices, an administrator has to balance the workload to ensure the successful completion of all backups within a particular period of time. When these devices were magnetic tapes, this assignment was trivial: find an idle tape drive, write what fits on a tape, and replace tapes as needed. Backing up data onto deduplic...

Data Management Systems in enterprises constitute a significant portion of the total cost of management of data in enterprise systems. Maintaining data with a high degree of availability and reliability is typically done by having a centralized backup system that to maintain backup copies of data present on the workstations of enterprises. Maintaining a large dedicated backup server for data ma...

This paper addresses the major challenges that large organizations face in protecting their valuable data. Some of these challenges include recovery objectives, data explosion, cost and the nature of data. The paper explores multiple methods of data protection at different storage levels. RAID disk arrays, snapshot technology, storage mirroring, and backup and archive strategies all are methods...

Cloud storage provide storage service to user through internet. There are many different access interface for different applications. Online backup is the most developed application. Most comparison of online backup service focus on functional characters. There is not too much consider about performance evaluation. In this paper, we present a method to evaluate performance of different online b...

Social network-based systems, also known as Friend-to-Friend (F2F) systems, are a promising approach to develop backup solutions that provide high reliability with a much lower consumption of bandwidth and storage than P2P ones. F2F backup systems can use two data redundancy strategies to handle peer failure events, namely: replication and erasure coding. In this paper we evaluate the use of th...

Storage capacity, like computing power, follows its Moore’s law and grows dramatically. Consequently, the need for data backup services increases. The domain of data backup was recently hit by the peer-to-peer wave: several projects propose to use a cooperative approach to the backup problem. In this paper we survey these projects, the various problems they face and the techniques they propose ...