Of course it does not help to mirror your data by adding more disks to your own computer because a fire, flood, power surge, etc. could still wipe out your local data center.

• 当然通过在你的机子上增加更多的磁盘来镜像你的数据也是无助的，因为一次火，洪水，电力波动等因素将仍然破坏你局部的数据中心。