Patent ID: 8543548

Claim:
A storage system, comprising: a first storage apparatus coupled to a client computer and including, a first processor, a first memory storing a program executed by the first processor, a first storage area including a first storage region and a second storage region, the first storage region storing a plurality of file data which are access targets of the client computer, the second storage region storing the backup data of the file data by control of the first processor, and a second storage apparatus coupled to the first storage apparatus and including, a second processor, a second memory storing a program executed by the second processor, a second storage area storing one or more first data of the plurality of file data migrated from the first storage area by control of the first and second processors, wherein when backup of the plurality of file data from the first storage region is executed, the first processor is configured to create copy data of the file data as backup data and store the backup data to the second storage region, and manage a first time at which the backup data is created, and, the first processor is configured to create a stub indicating a storage location for the first file data in the second storage area, store the stub in place of the first file data in the first storage region, and sends the first file data to the second storage area, and the second processor is configured to store the first file data in the second storage area, and manages a second time at which each of the first file data is migrated, and when the plurality of data of the first storage region is recovered using the backup data in the second storage region, the first processor is configured to replace the plurality of data in the first storage region with the backup data in the second storage region, and send the first time to the second storage apparatus, the second processor is configured to compare the first time received from the first storage apparatus with the second time for each of the one or more first file data stored in the second storage area, and extracts first file data from the one or more first file data for which the second time is newer than the first time, and the first processor is configured to restores a stub indicating a storage location in the second storage area of the extracted first file data, and stores the stub in the first storage region.