A system or sometimes known as an OS backup basically creates a bootable backup of a the operating system structures necessary to rebuild the operating system.

系统——或有时称为OS——备份主要创建一个可引导的操作系统结构备份，这是重新构建操作系统所必需的。

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Include files (or header files) define constants, macros, and other structures used in the operating system or in a particular library.

包含文件(或者头文件)定义了在操作系统中或特定的库中使用的常量、宏以及其他结构。

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It is the responsibility of the operating system (OS) to determine if the update frequency has changed and to make the necessary adjustments to its internal structures.

操作系统(OS)要负责确定更新频率是否发生了变化，以及对内部结构进行必要的调整。

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