| 摘要 |
A method and system for prioritizing, securing, and reducing the amount of data transmitted and stored during the creation of a backup copy of file data. Sectors in which changes have been made are identified as are the actual changes made to the sectors. Only the actual changes within each changed sector, along with the HCS number and a byte offset identifying the location within the sector at which the changes occur, are transmitted to the backup site. Files that are to be transmitted to the backup site are prioritized according to ratings based on predetermined criteria. Higher rated files are transmitted to the backup site prior to lower rated files. The files that are to be transmitted to the backup site are encoded and double encrypted. All instances of predetermined client-specific data elements within each file are identified and replaced by a corresponding code prior to encryption. The file data is then encrypted using multiple, indirect encryption keys, variable block lengths, and variable algorithms based on a client-selected string of characters. The files are thereafter encrypted again at the client site prior to transmission to the backup site. A program registry is maintained at the backup site that contains a master copy of many commercially-available files. The incoming files received from the client site are compared to the files in the program registry. If an incoming file is located in the registry, the file is replaced by a token identifying the commercially-available file and the token is stored at the backup facility.
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