He wants to copy its contents onto a separate backup drive.
他想把电脑中的部分内容拷贝到单独的一个备份盘上。
Its Volt has a backup engine to power the car when the electricity drains out.
当电能耗尽时，它有一个储备电压的发动机能给汽车带来强大的动力。
Its Volt has a backup engine to power the car when the electricity drains out.
当电能耗尽时，它有一个储备电压的发动机能给汽车带来强大的动力。
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