Patent ID: 6850958

Claim:
A backup system including a database apparatus having a plurality of databases and a backup apparatus for holding a backup of information stored in the database apparatus, wherein said database apparatus comprises: update information generating means for generating, with respect to the individual databases, update information indicating contents of updates of the databases; interrelation information generating means for generating interrelation information indicating an interrelation between the update information for a certain database and the update information for other databases; and transmitting means for transmitting the update information and the interrelation information to said backup apparatus, and said backup apparatus comprises: receiving means for receiving the update information and the interrelation information transmitted from said database apparatus; backup databases for holding backups of contents of the databases owned by said database apparatus; interrelation determining means for looking up the interrelation information received by said receiving means to determine the interrelation of each said update information; and updating means for updating said backup databases based on the update information of which the interrelation is verified by said interrelation determining means; wherein the interrelation information is a serial number, and if there exists no other update information interrelated with the update information concerned, a serial number of immediately preceding update information is affixed to the update information concerned.