Patent ID: 8065557

Claim:
An apparatus for managing a data backup between a client computer and a storage device, the apparatus comprising: a backup data manager for managing a backup data stored in the storage device, the backup data including a plurality of files; a restored data condition manager for managing a condition for extracting a data to be restored from the backup data; a data extractor for extracting an integrity verification data satisfying the condition from the backup data; and a client computer interface for transmitting the integrity verification data to the client computer, wherein the condition includes a first extraction condition for extracting a temporary data from the backup data, and a second extraction condition for extracting the integrity verification data based on the temporary data extracted according to the first extraction condition, and the data extractor sorts the temporary data in a random order after extracting the temporary data from the backup data based on the first extraction condition, and extracts the integrity verification data from the sorted temporary data based on the second extraction condition.