Patent
Incremental computer file backup using check words
Arnon Kanfi
- 27 Jun 1995
365
TL;DR: In this article, a file is divided into a number of blocks and a "signature" is generated for each such block, and a block is then stored in the backup memory only if its associated signature differs from a signature generated for an earlier version of the block.
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Abstract: A facility is provided for storing in a backup memory only those blocks of a file, or disk partition, which differ from corresponding blocks forming an earlier version of the file. Specifically, a file is divided into a number of blocks and a "signature" is generated for each such block. A block is then stored in the backup memory only if its associated signature differs from a signature generated for an earlier version of the block. In addition, if two blocks of the current version of the file have identical signatures and are to be stored in the backup memory, then only one of the two blocks is stored in the memory and a simple message indicating that the other block is equal to the one block is stored in the memory for the other block. Further, the application of such signatures is advantageously applied to the opposite case of restoring a file using copies of previous versions of the file that are stored in the backup memory.
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Citations
Patent
System for backing up files from disk volumes on multiple nodes of a computer network
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- 21 Oct 1996
TL;DR: In this paper, the authors propose a system for backuping files from disk volumes on multiple nodes of a computer network to a common random-access backup storage means, where duplicate files (or portions of files) may be identified across nodes, so that only a single copy of the contents of the duplicate files or portions thereof is stored in the backup storage mean.
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Mark Squibb
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TL;DR: A computer apparatus and method for merging system deltas, and more particularly to a computer apparatus, can be found in this article and can be used to save, construct and/or retrieve current and historical system states.
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