使用者通过提交文档的快照到版本仓库，从而能够跟踪文件的修改历史，不至于丢失历史记录。
It allows the user to 'commit' a snapshot of any directory to a 'repository' that tracks all of the changes between versions of the files.
清单15给出修改后的批文件，增加的JVM跟踪配置行以粗体显示。
Listing 15 shows the modified batch file, with the additional JVM trace configuration lines shown in bold.
ext3 文件系统驱动程序也使用这种方法，存储内存中被修改的块（大小为 1K、2K 或 4K）的完整副本，以跟踪暂挂的 IO 操作。
The ext3 filesystem driver also uses this approach and stores complete replicas of the modified blocks (either 1K, 2K, or 4K) in memory to track pending IO operations.
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