Provided is a backup method including a step (S1) of reading a log which is a data update difference, and identifying a data storage area (page) of backup data, a step (S2) of determining high/low reusability of the identified data storage area, a step (S3) of storing a log corresponding to a data storage...http://www.google.fr/patents/US7640276?utm_source=gb-gplus-shareBrevet US7640276 - Backup system, program and backup method
