Information processing device, data management method, and storage device

A data management method executed by an information processing device including a first storage unit, the data management method comprising:

• setting, in an external device, device identification information of the information processing device;
• storing, by the information processing device, a duplicate copy of data stored in the first storage unit in a second storage unit included in the external device;
• invalidating, in response to an instruction for invalidating data, the data stored in the first storage unit;
• and
• restoring the duplicate copy stored in the second storage unit on the first storage unit at a time of start-up of the information processing device after the invalidation when the external device is connected to the information processing device and the device identification information is set in the external device.

A storage device comprising:

• a first storage unit to store therein device identification information of an information processing device, the device identification information being set by the information processing device;
• a second storage unit to store therein a duplicate copy of data stored in a third storage unit included in the information processing device;
• and
• a processor to allow the duplicate copy stored in the second storage unit to be restored on the third storage unit when device identification information that coincides with the device identification information stored in the first storage unit has been input from the information processing device.