DATA COPYING SYSTEM AND DATA COPYING METHOD

摘要

When a copy request or a synchronism request is issued by a copy managing unit (201) of a copy receiving node (200) to a copy making node (100), all of the files of copy object data (121) or updated contents are stored as managing data (generation) in a managing data file (122) of the copy making node (100). In response to the issued request, the generation data stored in the managing data file (122) is transmitted as it is, or the differential data between the generations is transmitted as transmission data to the copy receiving node (200).