In a perfect world, this would be sufficient, but computers and software can crash, power can fail, and other unpredictable, catastrophic events can conspire to erase your work.

• 在一个完美的世界里，这就足够了。 但是计算机和软件会崩溃，电源可能会断掉，其他不可预测的灾难会凑巧同时发生而丢掉你的工作。