| 摘要 |
According to an embodiment, when data read from a first storage unit which is a backup source is not identical with data indicated by a first function, the read data is written to a second storage unit which is a backup destination. When the data read from the first storage unit is identical with the data indicated by the first function, the read data is not written to the second storage unit and a deletion notification is sent to the second storage unit. |
