Patent ID: 7136976
Filing Date: 2006-11-14
Classification: G06F,Y10S

Abstract:
1. A backup system, comprising: a backup destination storage device, which is the backup destination of backup target data to be a target for backup; a backup source device that comprises a backup execution module to back up the backup target data by transferring the backup target data to the backup destination storage device; an additional information storage medium configured to store additional information created on the basis of the backup target data; and an additional information creation module to create additional information on the basis of the backup target data after a backup of the backup target data has been completed and then store the additional information in the additional information storage medium; wherein the backup source device further comprises: a timing selection module, which selects, on the basis of predetermined conditions, either one of synchronous timing for creating the additional information when the backup is performed or asynchronous timing for creating the additional information after the backup has been performed, as the timing for creating the additional information; and a synchronous-type additional information creation module, which, when the synchronous timing is selected, creates the additional information when the backup is performed and stores this additional information in the additional information storage medium.