Patent ID: 8819205
Filing Date: 2014-08-26
Classification: G06F

Abstract:
1. A content transfer system comprising: a plurality of first storages storing first contents; a second storage storing second contents; and a third storage storing third contents; wherein said first storages, said second storage and said third storage are connected via a communication network, and send and receive information concerning each of said contents via the communication network; wherein said first storages send identifying information for specifying a backup target among said first contents to said second storage; wherein said second storage receives said identifying information, determines whether said backup target content exists in said second contents or said third contents based on said identifying information and sends a determination result to said first storages; wherein if said backup target content exists in said second contents and said third contents, said second storage compares a first quality of a part of said backup target content existing in said first contents, a second quality of a part of said backup target content existing in said second contents and a third quality of a part of said backup target content existing in said third contents; wherein if said backup target content exists only in said second contents, said second storage compares said first quality with said second quality; wherein if said backup target content exists only in said third contents, said second storage compares said first quality and said third quality; wherein said first storages send said target content and management information to be used for managing the backup of said backup target content to said second storage if said first storages receive said determination result indicating that said backup target content does not exist in said second contents or said third contents; wherein said first storages send the part of said backup target content and management information to be used for managing the backup of said backup target content to said second storage if said first storages receive said determination result indicating that said second quality and said third quality are inferior to said first quality; wherein said first storages send said management information to be used for managing the backup of said backup target content to said second storage if said first storages receive said determination result indicating that said backup target content exists in said second contents or said third contents, and if said first quality is inferior to said second quality or said third quality; wherein said second storage requests said third storage to transfer the part of said backup target content existing in said third contents if said backup target content exists in said third contents and if said third quality is better than said first quality and said second quality; and wherein said management information to be used for managing the backup of said backup target content is configured from metadata that is associated with said backup target content.