| 摘要 |
Provided is a backup method including a step (S 1 ) of reading a log which is a data update difference, and identifying a data storage area (page) of backup data, a step (S 2 ) of determining high/low reusability of the identified data storage area, a step (S 3 ) of storing a log corresponding to a data storage area determined to be low in reusability in a log storage area preset on a memory, and a step (S 4 ) of applying a log corresponding to a data storage area determined to be high in reusability to the identified data storage area in a cache area set on the memory, and updating the data storage area. Thus, by further reducing the number of I/O times in an external storage system of a standby system which backs up data by log transfer, it is possible to reduce introduction costs of a backup system and its normal-time operation's costs at normal times.
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