05813017 is referenced by 712 patents and cites 13 patents.

In a client/server environment, a method and means for reducing the storage requirement in the backup subsystem and further reducing the load on the transmission bandwidth where base files are maintained on the server in a segmented compressed format. When a file is modified on the client, the file is transmitted to the server and compared with the segmented compressed base version of the file utilizing a differencing function but without decompressing the entire base file. A delta file which is the difference between the compressed base file and the modified version of the file is created and stored on a storage medium which is part of the backup subsystem. Alternatively, a copy of frequently accessed base files are maintained on the client in a compressed format. Whenever the client detects that a frequently accessed file has been modified, the modified version of the file is differenced against the base version of that file without decompressing the entire base file and a delta file is generated. The delta file is then transmitted to the server to be stored at the server for storage medium to be utilized either immediately or at a later time to update the base version of the modified file on the server.

Title
System and method for reducing storage requirement in backup subsystems utilizing segmented compression and differencing
Application Number
328204
Publication Number
5813017
Application Date
September 3, 1996
Publication Date
September 22, 1998
Inventor
Robert J T Morris
Los Gatos
CA, US
Agent
Paik Saber
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 17/30
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