Data backing up for networked storage devices using de-duplication technique
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United States of America Patent
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Dec 4, 2012
Grant Date -
Aug 27, 2009
app pub date -
Feb 25, 2009
filing date -
Feb 26, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique of backing up data for networked storage devices using de-duplication is disclosed in which a communication device divides a to-be-stored new file into data blocks, defines and updates a statistical value representative of a history of reference to each data block within previous files, and transmits the statistical value to another communication device. The communication device, upon reception of the statistical value, selects a preloaded data block, based on the received statistical value, and transmits to another communication device a copying request for making a copy of a real data block identical to the preloaded data block. The communication device, upon reception of the copy, stores the copy as the preloaded data block.
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