Backup system and associated methodology for storing backup data based on data quality

摘要

In a backup system, a backup request device includes: a storage section that stores a piece of content data; and a transmission section that regards the piece of content data as a piece of backup target data and transmits, along with a piece of device identification information, a piece of backup information including a piece of data quality information and a piece of content identification information, while a backup device includes: a storage section that stores a piece of backup data that is the same content as the piece of backup target data and whose data quality is higher than or equal to the piece of backup target data such that it is associated with the piece of content identification information; and a control section that stores the received piece of backup information in the storage section such that it is associated with the received piece of device identification information.