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rsync will transmit only the delta between the source and destination.


Believe there are command-line flags necessary to make it do that though: --inplace --no-whole-file


--no-whole-file is the standard, except for local paths (on the same system, the delta-transfer algorithm would be a waste of work, as it reads src and dst to find the delta with rolling checksums -- over the network it can save lots of time and bandwidth)

--inplace is independent of that: it specifies writing directly to target files (instead of write to temp file and rename to target after completion)




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