Abstract: A backup method of a computer system capable of recovery independently by a backup center alone, even if reorganization of a DB cannot be completed due to a disaster of some kind.

Abstract: When data is updated in response to execution of an application by a host, an operation center apparatus records update history data into an update history file and updates a database. A remote copy apparatus consisting of network storages transfers and records the update history data via a network into a backup update history file at a transfer destination every time the update history data is recorded into the update history file by the operation center apparatus. When the operation center apparatus goes down, a backup center apparatus restores a management file for managing usage situation of the backup update history file from the backup update history file and, by reference to the management file, sequentially reads out the backup update history file until discontinuity of update history data is identified to update a database for backup.

Abstract: When data is updated in response to execution of an application by a host, an operation center apparatus records update history data into an update history file and updates a database. A remote copy apparatus consisting of network storages transfers and records the update history data via a network into a backup update history file at a transfer destination every time the update history data is recorded into the update history file by the operation center apparatus. When the operation center apparatus goes down, a backup center apparatus restores a management file for managing usage situation of the backup update history file from the backup update history file and, by reference to the management file, sequentially reads out the backup update history file until discontinuity of update history data is identified to update a database for backup.