Abstract: A storage device for storing data includes, a first storage part which stores data, a second storage part which stores backup data of the data stored in the first storage part, a writing order determination part which determines a writing order of data to the second storage part such that the writing order is an order from data whose storage period remains longest to data whose storage period remains shortest, and a writing control part which performs control such that the data stored in the first storage part is written to the second storage part in accordance with the writing order.

Abstract: A non-transitory computer-readable medium storing an data storing program executed by an archive device including a first storage unit for storing data and a second storage unit for storing hash value determined from the data, the program causing the archive device to execute a process includes receiving hash value determined from data to be stored from an external device which requests storage of the data, comparing the received hash value with the hash value stored in the second storage unit, and transmitting request information for transmitting the data corresponding to the received hash value to the external device which transmits the hash value when the received hash value has not been stored in the second storage unit.

Abstract: A storage device for storing data includes, a first storage part which stores data, a second storage part which stores backup data of the data stored in the first storage part, a writing order determination part which determines a writing order of data to the second storage part such that the writing order is an order from data whose storage period remains longest to data whose storage period remains shortest, and a writing control part which performs control such that the data stored in the first storage part is written to the second storage part in accordance with the writing order.

Abstract: A non-transitory computer-readable medium storing an data storing program executed by an archive device including a first storage unit for storing data and a second storage unit for storing hash value determined from the data, the program causing the archive device to execute a process includes receiving hash value determined from data to be stored from an external device which requests storage of the data, comparing the received hash value with the hash value stored in the second storage unit, and transmitting request information for transmitting the data corresponding to the received hash value to the external device which transmits the hash value when the received hash value has not been stored in the second storage unit.