Data insertion system

A data insertion system is provided with a storage system (1), a backup storage (2), and a backup controller (3). The data insertion system is provided with a first distributed index information acquisition unit (311) which acquires first distributed index information when arranged in a storage system (1); system configuration information which indicates configuration of disk drives (111) to (114); a configuration information request unit (312) which requests second distributed index information of the storage system (1) to the storage system (1); a device distributed index information generation unit (1011) which generates the system configuration information and the second distributed index information; and a new data arrangement information generation unit (314) which generates new data arrangement information on the basis of the generated system configuration information and second distributed index information, and the first distributed index information.