Checksums and Verbose Transfers
The rsync command uses file checksums (near-unique signatures) to determine whether any files on the transfer source are already on the destination.
The first time you transfer an entire directory hierarchy to a remote host, rsync sees that none of the files already exist at the destination, and it transfers everything. Testing your transfer with rsync -n verifies this for you.
After running rsync, try running it again, but this time as rsync -n or rsync -v. This time, no files should show up in the transfer list because an exact copy of the file set exists on both ends, so the file checksums are the same.
However, when the files on the source side are not identical to the files on the destination side, rsync transfers ...
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