A remote copy system includes a first storage system including a first storage controller and a first data volume. The first storage controller is configured to control data access requests to the first data volume. The first storage system is configured to store write data in the first data volume upon receiving a write request from a first host that is associated with the first storage system. A second storage system includes a second data volume and configured to receive first copy data sent from the first storage system and store the first copy data in the second data volume, the first copy data corresponding to the write data stored in the first data volume. A third storage system includes a second storage controller and a third data volume and configured to receive second copy data from the second storage system and store the second copy data to the third data volume, the second copy data corresponding to the first copy data, the third data volume mirroring the first data volume. A fourth storage system includes a fourth data volume and configured to receive third copy data sent from the third storage system and store the third copy data to the fourth data volume, the third copy data corresponding to the second copy data.