创建系统映像的备份应用程序如何处理映像创建过程中的磁盘更改？
我昨天创建了磁盘的备份磁盘映像，软件告诉我关闭所有 Windows 程序以确保该过程成功完成。
我这样做了，但我想知道当某些程序在此过程中确实写入磁盘时会发生什么。 Windows 7 是一个复杂的系统，肯定会连续写入各种日志文件等（磁盘有一个分区也包含 Windows 安装）。当镜像创建过程中磁盘内容发生变化时，备份软件如何处理？
这种情况下的算法是什么？
I created a backup disk image of my disk yesterday and the software told me to close all Windows programs to make sure the process finishes successfully.
I did that, but I was wondering what happens when some program does write to the disk nevertheless during the process. Windows 7 is a complex system and surely various log files and such are written continuously (the disk has one partition which contains the Windows install too). How does the backup software handle it when the disk content is changed during image creation?
What is the algorithm in this case?
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快照，或 Microsoft 所说的“卷影复制”，请参阅 wikipedia 上的卷影复制
Snapshotting, or 'Shadow Copy' as Microsoft calls it, see Shadow Copy on wikipedia