We should back up our data regularly by making soft copies of them.
问题描述：
We should back up our data regularly by making soft copies of them.
答
back在这里应该是不及物动词,所以与UP 连用构成vt." data"是资料的意思.by 是通过,表示一种手段 ；“making soft copies of them”这里的"them"是指前面提到的“data".
我认为应该是：将资料拷贝到软盘里面将有利于我们更好的保存的它们.