BACKUP STORAGE SYSTEM THAT BACKS UP DATA AND BACKUP STORAGE DEVICE AND METHOD

摘要

This data storage device creates full backup images or incremental backup images, as backup images, depending on whether or not the backup is the initial backup. The created backup image is transferred to the backup storage device. A full backup creation unit in the backup storage device executes, in generation order, merge processing that merges incremental backup images with full backup images. A reverse incremental backup acquisition unit in the backup storage device acquires, in generation order, reverse incremental backup images used in the restoration of pre-merge full backup images from post-merge full backup images.