If something goes terribly wrong, they can always go back to the running system from yesterday.
如果系统某一部分发生严重故障，它们可以总是从昨天返回正在运行的系统。
One quick example: on our recent trip to Japan, I told my kids to expect things to go wrong - they always do on a trip.
举一个简单的例子：我和孩子们去日本旅游时，我告诉他们像每次旅游一样的期望旅途不顺利。
Things kept happening that he wasn't expecting, and they always seemed to go wrong at 5pm on a Friday, or just as the team were starting work on an urgent order.
出乎他意料的事情不断发生，而且在周五下午5点钟的时候他们似乎总是会出错，或者是当团队开始赶一批加急订单的时候。
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