Patent ID: 8392681

Claim:
A storage system that is coupled to a first computer and a second computer and backs up data in a storage device coupled to the second computer, the storage system comprising: a first logical volume in which write data is written in accordance with a write request received from the first computer; a second logical volume that stores journal data of the first logical volume, the journal data being delimited at predetermined points in time, the second computer being unable to read the journal data from the second logical volume; a third volume which is a virtual volume; a virtual-volume creating unit that creates the third volume which the second computer is able to access to read at least the journal data in order to back up the first logical volume at a predetermined point in time; a mapping unit that maps an address where the journal data is stored in the second logical volume to the third volume that is created by the virtual-volume creating unit; and a backup unit that reads the journal data from the second logical volume according to the address mapped to the third volume in accordance with a read request with respect to the third volume from the second computer, and transfers the journal data to the second computer in order to store the journal data in the storage device.