Patent ID: 7409414

Claim:
A computer system comprising: at least one host computer; a storage system for obtaining a snapshot, at a specific point in time, of a data volume to and from which data used by the host computer is written and read, storing data written to the data volume after the specific point in time as a journal, and applying the journal to the snapshot, for data recovery, on the basis of a snapshot obtained in close proximity to a recovery point, thereby recovering data; and a management computer; wherein the host computer, the storage system, and the management computer are connected to each other via a network; and the management computer instructs the storage system to determine whether data at a recovery point after a recovery point of the latest snapshot can be recovered within a specific period of time and to apply, if it has been determined that the data cannot be recovered within the specific period of time, a journal to the latest snapshot to update the latest snapshot to a new snapshot in such a manner that the data can be recovered within the specific period of time.