| 摘要 |
Provided is a backup device, etc., that updates copy data appropriately. A backup device 300 , which records as copy data a copy of original data stored in multiple storage devices 110 A to 110 D, comprises: a write data storage unit 132 , for receiving and storing write data to be written to the original data; and an updating unit 134 , for using the write data to update the copy data when update permission data, which permit the use of the write data to update the copy data, are externally received.
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