Patent ID: 6014676
Filing Date: 2000-01-11
Classification: G06F,G06Q,Y10S

Abstract:
A system for backing up files in user computers, comprising:a data center;a plurality of user computers remote from the data center and in communication with the data center;subfile incremental back up logic means associated with each user computer for determining changed blocks that have been changed since a predetermined back up time and generating changed block signals in response thereto;chunk transmission logic means responsive to the subfile incremental logic means for sending only changed blocks to the data center in chunks having a predetermined size;synchronizing logic means responsive to the changed block signals for synchronizing the subfile incremental logic means; andlogic means for generating a listing of the blocks of the files stored at the data center and, associated with each block, the first two characters of the block and a digital signature of the block, and the subfile incremental logic means uses the listing to undertake the determining function.