这里"back up"才是短语,而不应该加上from.
back up如果back做动词,表示“支持,支援,帮助”,你给的句子不完整,但看起来是back做动词了.
另外,back-up可以做名词,意思可有动词延伸,“后援、贮藏”,但貌似也有“阻塞”之意,但这种用法很少.
英语翻译；back up from the more general case.back up from是短语做做解释
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