硬链接的创建和维护开销很低，所以只使用增量方案就可以模拟完整备份的效果。

Hard links are very cheap to create and maintain, so a full backup is simulated using only an incremental scheme.

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程序数据库(PDB)文件保存着调试和项目状态信息，使用这些信息可以对程序的调试配置进行增量链接。

A program database (PDB) file holds debugging and project state information that allows incremental linking of a debug configuration of your program.

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