Patent ID: 7395284

Claim:
A storage system comprising a backup processing system located at a first site and including a first storage apparatus having a memory unit and a controller and a first information processing system being connected to the first information processing system via a local area network and executing a backup process relating to a plurality of other sites; and a plurality of backup target systems each located at one of said other sites and each including a second information processing system having and a second storage apparatus that stores data to be a backup target, said second storage apparatus being connected to a respective second information processing system via a respective local area network, wherein said first information processing system and said second information processing system are connected through a communication network, and said first information processing system simultaneously backups, at a temporal point for executing said backup process, backup data of said backup target from said second storage apparatus located at said other sites into a memory area in said first information processing system through said communication network and then into said first storage apparatus, by obtaining a temporal synchronization; wherein at a point for executing said backup process, said first information processing system executes a first process for converging said backup data from said second storage apparatus, into said first information processing system by obtaining said temporal synchronization, and for obtaining the converged backup data, and a second process for transferring each piece of backup data obtained in said first information processing system to the memory area in said first information processing system, and for storing the transferred backup data.