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中文摘要：
针对在文件备份服务器中存在大量重复数据的问题，设计了一种基于重复数据删除的文件备份系统，为位于不同地理位置的多个用户提供备份服务。该系统不仅删除用户内部的重复数据，也删除不同用户之间的重复数据，进一步节省存储空间，与此同时，采用了一定的安全机制来防止数据丢失以及用户数据信息泄漏。实验结果表明了系统的可行性，为多用户构建统一的备份中心提供了一种新的解决方案。
英文摘要：
To address the problem of vast amount of duplicate data in the file backup server, a deduplication-based file backup system is proposed, which has the capability of providing service for multiple users located anywhere. It eliminates not only the duplication data inside the single user, but also the duplication data among multiple users. Through this method, the storage space of backup server is economized further. Simultaneously, some security measures are applied to preventing data loss and user information leakiness. At last, the experiments show the viability of the system which provides a new solution of centralized backup for multiuser.
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