Patent ID: 7117329

Claim:
A method of managing backup data in a storage system carried out by a storage control device, said backup data being generated in each of a plurality of pairs originating from one volume, said method comprising: receiving, from a host computer, a split request for stopping synchronization between a primary volume and a secondary volume in one of said pairs, and version information about a split process corresponding to said split request; performing said split process in which a backup between said primary volume and said secondary volume of said pair is performed in response to said split request and the synchronization of said pair is stopped; storing, for said pair, said version information of said split process in a predetermined storage section; receiving, from said host computer, a restore request for restoring said primary volume to contents of said secondary volume, without receiving version information for said restore request; extracting said version information of the split process that has been stored for each of said plurality of pairs in said storage section, and notifying the extracted version information to said host computer; receiving, from said host computer, version information that has been selected from among said notified version information, and taking the selected version information as the version information for a restore process corresponding to the received restore request.