Patent ID: 8010496

Claim:
A computer system, comprising: a host computer which has a first processor, a memory, and a first interface, the first processor performing computing, the memory being coupled to the first processor and storing an application program which performs a task, the first interface being coupled to the first processor; a first storage system which has a second processor, a first storage device, and a second interface, the second processor performing computing, the first storage device including a data volume which stores data requested by the application program to be written, the second interface being coupled to the second processor; at least one second storage system which has a third processor, a second storage device, and a third interface, the third processor performing computing, the second storage device including a mirrored volume which stores a copy of the data stored in the data volume, the third interface being coupled to the third processor; and a management computer which has a fourth processor, a memory, and a fourth interface, the fourth processor performing computing, the memory being coupled to the fourth processor, the fourth interface being coupled to the fourth processor, wherein the first storage device includes a plurality of backup volumes where backup processing for copying the data stored in the data volume is executed, wherein the second storage device includes a plurality of backup volumes where backup processing for copying the data stored in the mirrored volume is executed, wherein the management computer is configured to receive an input of a policy about the backup processing executed in the backup volumes, set a configuration of the first storage device and a configuration of the second storage device under the received policy; and execute the backup processing in the plurality of backup volumes included in the first storage device and the plurality of backup volumes included in the second storage device according to the set configuration of the first storage device and the set configuration of the second storage device, wherein the policy includes a count of backup volumes storing data copied by the backup processing, and wherein the management computer is configured to calculate a quotient of the count of backup volume divided by a total count of the first storage system and the at least one second storage system, and set as many backup volumes as a smallest integer equal to or greater than the calculated quotient in each of the storage device and the second storage device.