看了很多文章介绍OB的全量、增量、日志备份，目前可以理解全量和增量备份的时候，是根据备份的时候得到的一个时间戳，到OB server的每个宏块里边，根据mvcc的原理获得一致性的备份，增量也可以这么理解。（这实际上是从TiDB的备份原理看到的，OB没有找到相应的文档）。但是恢复到任意时间点的时候，目前只看到通过clog的的解析还原到OB server，我的疑问从这里开始的： 1. 每一个OB....

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