The backup utility compresses the data before hitting the disk, in the buffer.
备份实用程序在到达磁盘之前在缓冲区中压缩数据。
It reads entire files into its own buffer, makes the specified operations on that copy, and optionally writes the buffer to disk.
它将整个文件读入自己的缓冲区，对该副本执行指定的操作，并可选地将缓冲区写到磁盘。
Once a checkpoint occurs, the disk buffer is released.
在出现检查点时，就会释放磁盘缓存。
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