Data backup device and data backup method
OwnerKenichi HAGA, Seiji Sakaki +1inventors
InventorsKenichi HAGA, Seiji Sakaki, Shigeyuki Ochiai
Life of this patent
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Abstract
A backup data validity deciding flag 11 showing whether backup data is in a state of validity or invalidity is used to shelter data stored in a backup source storing medium 20 to a backup destination storing medium 21 and the flag 11 is changed to a validity. Further, when the data stored in the backup destination storing medium 21 is returned to the backup source storing medium 20, the flag 11 is changed to an invalidity. When the flag 11 shows the invalidity, the data is not returned. That is, when the backup data is returned once, the data cannot be returned again until a next sheltering process of the data arises.
Claims13
A data backup device that shelters data stored in a first storing medium in a second storing medium, said data backup device, comprising:
- a data transfer unit that shelters the data stored in the first storing medium in the second storing medium and returns the sheltered data to the first storing medium;
- a flag unit that shows whether the data stored in the second storing medium is valid or invalid;
- and
- a transfer managing unit that allows the data transfer unit to shelter the data and sets the flag unit to a validity, when the data stored in the first storing medium is sheltered in the second storing medium, and on the other hand, allows the data transfer unit to return the data and sets the flag unit to an invalidity when the data stored in the second storing medium is returned to the first storing medium.
A data backup device that shelters data stored in a first storing medium in a second storing medium, said data backup device comprising:
- a data transfer unit that shelters the data stored in the first storing medium in the second storing medium, generates identifying information exclusively coordinated with the contents of the data, and on the other hand, returns the sheltered data to the first storing medium, and evaluates the propriety of the sheltered data by using the identifying information;
- an identifying information storing unit in which the generated identifying information is stored;
- and
- a transfer managing unit that allows the data transfer unit to shelter the data when the data stored in the first storing medium is sheltered in the second storing medium, and on the other hand, allows the data transfer unit to return the data when the data stored in the second storing medium is returned to the first storing medium.
A data backup method in which a data backup device shelters data stored in a first storing medium to a second storing medium, said data backup method comprising:
- a validity setting step that sets a flag showing whether the data stored in the second storing medium is valid or invalid to a validity when the data backup device shelters the data stored in the first storing medium to the second storing medium;
- and
- an invalidity setting step that sets the flag to an invalidity when the data backup device returns the data stored in the second storing medium to the first storing medium.
A data backup method in which a data backup device shelters data stored in a first storing medium to a second storing medium, said data backup method comprising:
- a generating step that generates identifying information exclusively coordinated with the contents of the data when the data backup device shelters the data stored in the first storing medium to the second storing medium;
- a step that stores the generated identifying information in an identifying information storing unit by the data backup device;
- and
- an evaluating step that evaluates the propriety of the sheltered data by using the identifying information when the data backup device returns the sheltered data to the first storing medium.
Dependencies are inferred from the claim text.