文件系统通常为递增备份，这是为了最小化备份窗口和优化存储空间。
Filesystems are generally backed up incrementally to minimize the backup window and to optimize storage space.
在发生故障时，例如，在递增式备份完成后的星期六，可还原第一个星期日的完整备份，然后应用星期六的递增备份即可。
In the case of a failure, for example, on Saturday after the incremental backup is taken, you can just restore the first Sunday full backup and apply the incremental on Saturday. See Figure 35.
每一个连续的递增映像都包含前一递增映像的完整内容以及前一次完整备份后的更改。
Each successive incremental image contains the entire contents of the previous incremental image and the changes since the previous full backup.
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