原有数据 meaning in English

legacy data

An exact copy of data in a file transferred to another medium
图像，映像进入另一媒介中的文件里，对原有数据的完全复制
But most interactions add details or change body text or overlay data on the existing pages
但多数交互都是在已有页面上增加细节、修改主体文本或者覆盖原有数据。
For some special needs in global characteristics , it ' s necessary to integrate distributed , heterogeneous , autonomous and evolutional information components into a uniform platform , which has the transparent access mode for all these components
对于大型的企业、机构和学校而言，客观上要求将分散的数据管理，变为以依靠计算机网络为基础的集中式管理，同时又需要保持原有数据源的自治性。