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。
Apple could easily address this by including a bootable 4gb flash drive with the OS and disk utilities on it.
苹果可以很轻易地加上一个安装了操作系统和磁盘管理工具的4g闪存来做到这一点。
Before attempting a major OS upgrade I first made sure I had a bootable backup of my current Snow Leopard install on an external firewire drive.
在打算进行有较大风险的OS升级之前，我先确保自己当前的Snow Leopard有一个安装在外部火线驱动器上的可启动的备份。
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