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中文摘要：
为了提高容灾系统中归档文件的恢复效率，提出了一种文件集的逆向差异归档方法，避免了文件集的正向差异归档方法在恢复最近归档点文件集时，进行多次重构而导致的效率低下的缺点。该方法在差异备份时，除了计算新旧文件集的正向差异，还计算新旧文件集的逆向差异，并始终保存最新归档点的完全文件集；在恢复时，从最新归档点开始，使用逆向差异，对归档点文件集进行逆向的重构和恢复。实验结果表明，与传统的正向差异归档方法相比，该方法能显著提高对较新数据的恢复效率。
英文摘要：
To improve the efficiency of data recovery in disaster recover system, a file-based reverse differential archiving method is proposed. This method avoids the shortcomings of traditional files-set archiving method, such as the low efficiency to reconstruct and recover the latest data. During backup, the method calculates both the positive and reverse differential files-set, then keeps the complete files-set of the latest archive point. During the recovery, reverse differential files-set is used to reconstruct and recover files based on the time of the reverse. Experiments show that, compared with the traditional archiving method, the method can improve the recover efficiency obviously.
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