Patent ID: 8260754

Claim:
A computer system with a primary volume, from or to which a business server reads or writes data, and a secondary volume configured to back up data written to the primary volume, wherein the primary and secondary volumes are provided in a same storage apparatus or different storage apparatuses, the computer system comprising a management server configured to manage data backup and restoration between the primary volume and the secondary volume, wherein the management server includes: an information collecting unit configured to collect information from at least the business server, the storage apparatus with the primary volume formed therein, and the same or different storage apparatus with the secondary volume formed therein; a restoration deciding unit configured, in response to a restoration request received externally, to calculate time needed to execute restoration processing on a volume basis, time needed to execute restoration processing on a file basis, and time needed to execute restoration processing with a combination of the volume basis and the file basis based on the information collected by the information collecting unit, and to decide a restoration approach with a shortest restoration time for the restoration processing to be executed in response to the restoration request; and a storage management unit configured to notify the business server of the restoration approach decided by the restoration deciding unit; wherein the business server is configured to control the storage apparatus with the primary volume formed therein and the same or different storage apparatus with the secondary volume formed therein such that the restoration processing will be executed by the restoration approach of which the business server has been notified by the storage management unit.