| 摘要 |
A storage device includes: a storage unit for storing data; a memory for storing management information; a local storage unit for storing differential data; a controller for controlling the storage device in accordance with a process comprising the steps of: updating data; updating management information; transmitting differential data to the another storage device, the differential data being the updated portions of the data which have been updated after preceding backing up of data until current backing up of data; resetting the management information after transmitting the differential data; storing, when the storage device fails transmission of the differential data to the another storage device, the differential data and the associated management information in the local storage unit; and transmitting the differential data to the another storage device at a later time after resetting of the management information.
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