This set of changes supplies us with differences between the resource tree as a delta in time.

这组更改为我们提供了在不同时间点资源树的差别。

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We can use this to walk through the changes in the resource tree and determine what actions need to be taken based on the type of resource that has changed.

我们可以使用它查看资源树中的更改，并根据已更改的资源类型确定所需的操作。

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During backup and restore of file system, it needs to merge current backup resource tree and previous one, namely operations between catalog tree and resource tree.

文件系统备份和恢复过程中，需根据当前备份资源树和历史备份资源树进行合并等操作，这种操作在物理上表现为对目录树和资源树的处理。

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During backup and restore of file system, it needs to merge current backup resource tree and previous one, namely operations between catalog tree and resource tree.

文件系统备份和恢复过程中，需根据当前备份资源树和历史备份资源树进行合并等操作，这种操作在物理上表现为对目录树和资源树的处理。

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