数据同步是指从源数据到目标数据存储之间建立一致性的过程，反之亦然，并随着时间的推移不断协调数据。它是各种同步应用的基础，这些同步应用有档案同步和移动设备同步（例如个人数码助理）[1][2]。在加密领域，公钥服务器的同步也涉及到数据同步[3]。
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