把效用函数引入信息安全风险领域，利用其反函数，定义绝对损失效应和相对损失效应，用以度量安全风险。
Utility function was introduced into security risk area, and its inverse function is used to define absolute loss effect and relative loss effect as measure of risk.
换句话说，要想确保绝对没有数据损失，需要原样保存上次在线备份以来的日志。
In other words, to ensure absolute no data lost, these logs need to stay intact since the last online backup.
你最好养成说“你是绝对正确的”的习惯，你又没损失什么东西。
You’d better develop the habit of saying “you’re absolutely right”. It costs you nothing.
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