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Pickles · Jun 17, 2026

How rsync Knows What Not to Send

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Change one line in a two-gigabyte log file, run rsync to a server, and it finishes in about a second, having sent a few kilobytes. It did not re-upload the file. That part you probably knew. Here’s the part that’s genuinely clever, and that the “rsync only sends changes” summary skips right over. To send only the changed parts, rsync first has to know which parts changed — and the two copies of…

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