ESSENTIAL DATA MANAGEMENT SYSTEM, CALCULATOR, ESSENTIAL DATA MANAGEMENT PROGRAM, RECORDING MEDIUM, AND COMMUNICATION METHOD

摘要

Provided is a data backup system which does not require a shared disc or a designated server for backup. One server (S) functioning as a reception server inputs registration instructions which instruct to save data that is essential for the data processing executed by the processing execution unit (300) of said server (S). Once the registration instruction is entered, the reception server determines a server which acts as master in relation to the registration instruction between the other servers by means of communication, and transmits the registration instruction to the master server. The master server selects, on the basis of a predetermined selection rule and from among a plurality of servers, a server to which the essential data specified by the registration instruction is stored, and transmits data arrangement information indicating the correspondence between the selected server and the essential data to be stored to a retention server (for retaining the essential data) specified in the registration instruction. Upon receiving the data arrangement information from the master server, the retention server transmits the essential data to the selected server indicated in the data arrangement information.