The present invention relates to a system that includes one or more logical volumes for storing data; a snapshot producing section for producing snapshots for the logical volumes based on a pre-scheduled snapshot acquisition time; a remote copy section for remote copying difference data for the snapshots based on pre-scheduled remote copy start times; and a scheduling section for re-scheduling the time of one or more of an Nth snapshot acquisition time, an remote copy start time, and an (N+1)th remote copy start time, in such a manner that remote copying starting at the Nth remote copy start time finishes by the (N+1)th remote copy start time.