而可恢复性则是另一个十分有意义的设计原则，它不仅仅是指所做工作的备份，更是为孩子们提供了一种回落到已知系统状态的直观方式。
Recoverability is another interesting principle being explored. This encompasses not only backup of work, but also providing children with an intuitive way to fall back to a known system state.
备份数据的主要原则就是所有你认为重要的数据都有两份以上的物理备份。
The primary principle of backing up your data is that any important data should exist in two or more physical locations at once.
文中并没有给出一份完整的备份策略，而是以制订备份策略的原则作为主线，阐述有价值的信息。
It doesn't give a complete backup strategy but give some valuable information through introducing the principle how to making backup strategy.
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