| 摘要 |
PROBLEM TO BE SOLVED: To provide an on-line backup technique capable of backing up data without stopping on-line service. SOLUTION: A file I/O system call issued from a user application is taken by a file updating/reference management part 9, which transfers file reference/ updating information (file I/O data) to a replica preparation management part 19. The management part 19 generates a replica for a backup file in a memory 23. During the generation of the replica, a backup device management part 21 extracts backup file data from a file replica (physical file) 25 for the backup file, writes the extracted data in a backup device 3, and upon competing the replica of the backup file in the memory 23, writes the replica read out from the memory 23 in the physical file 25.
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