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In this paper, the authors study the benefits of a peer-assisted approach to online backup applications, in which spare bandwidth and storage space of end-hosts complement that of an online storage service. Via simulations, they analyze the interplay between two key aspects of such applications: data placement and bandwidth allocation. Their analysis focuses on metrics such as the time required to complete a backup and a restore operation, as well as the storage costs. They show that, by using adequate bandwidth allocation policies in which storage space at a cloud provider can be used temporarily, hybrid systems can achieve performance comparable to traditional client-server architectures at a fraction of the costs.
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