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Submitted by rork
DeltaCopy is an open source, fast incremental backup program. Let’s say you have to backup one file that is 500 MB every night. A normal file copy would copy the entire file even if a few bytes have changed. DeltaCopy, on the other hand, would only copy the part of file that has actually been modified. This reduces the data transfer to just a small fraction of 500 MB saving time and network bandwidth.
DELTACOPY
Rate this tool: 
(7 votes, average: 3.00 out of 5)
(7 votes, average: 3.00 out of 5)
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way buggy…
I found a more dependable tool, see my blog post: http://stimasta.wordpress.com/2010/04/01/how-i-backup-virtual-machines-locally-and-to-another-server/