RSync - Remote Synchronization Protocol:
"RSync is a remote file (or data) synchronization protocol. It allows you to synchronize files between two computers. By synchronize, I mean make sure that both copies of the file is the same. If there are any differences, RSync detects these differences, and sends across the differences, so the client or server can update their copy of the file, to make the copies the same.
RSync is capable of synchronizing files without sending the whole file across the network."
The rsync algorithm (original article)
This would be very useful for "cloud" servers, backups etc.
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