Efficiently utilizing the bandwidth of the host interface unit even after restoration. A controller manages a storage area of a disk as multiple logical units (LUs), as well as measures the bandwidth used by each host interface unit as load information, stores the load information at the time of the backup, and at the time of the restoration, restores the backup data in logical units in the restoration destination and, with reference to the load information, distributes the paths connecting the logical units in the access source and the logical units in the restoration destination to the host interface units.