A storage system data duplication method for copying data of a plurality of logical
volumes possessed by a first storage system to a second storage system includes
the steps of: (a) copying the data of the plurality of logical volumes to the second
storage system; (b) interrupting copying of the data of the plurality of logical
volumes to the second storage system; (c) starting copying of data of one or more
of the plurality of logical volumes to the second storage system; and starting
copying of data of ones of the plurality of logical volumes other than the one
or more logical volumes to the second storage system as delayed from the step (c),
shortening a time taken until completion of data duplication on recreation of a
group of paired logical volumes in a volume group after remote copy is temporarily stopped.