Patent ID: 8190580

Claim:
A system for data backup, comprising: a first computer system including: a data update unit for updating data; a data update record generating unit for generating a data update record of the updated data; and a data update record transmission unit for transmitting the data update record; a second computer system including: a data update record reception unit for receiving the data update record from the first computer system; a data update record storage unit for storing the received data update record; a log application unit for generating a copy of the data contained in the first computer system based on the stored data update record; and a backup data storage unit for storing the copy of the data; and a monitoring unit for monitoring the data update record transmitted by the first computer system, thereby instructing start and stop of the second computer system, wherein the second computer system comprises: a second computer including the data update record reception unit and the log application unit; and a second storage system including the data update record storage unit and the backup data storage unit, wherein the monitoring unit monitors the data update record transmitted by the first computer system, thereby transmitting an instruction for stopping the second computer when a predetermined first condition is satisfied, and transmitting an instruction for starting the second computer when a predetermined second condition is satisfied, and wherein the second computer comprises a communication unit for receiving the instruction from the monitoring unit, and controlling the start and stop of the second computer, and, when the second computer starts, causes the log application unit to function and to generate the copy of the data contained in the first computer system based on the data update record stored in the data update record storage unit.