> If the file exists on the destination, but is different, rsync
> will attempt to only send the differences over the wire and not
> the entire file. (The algorithm for this was the author's thesis project.)
Note that this (just like the "-z" command line option) only works when
accessing those remote files via something like SSH. If those files are
accessed via something like NFS or Samba (i.e. the OS handles the remote
access, rather than rsync), then this will have no effect since as far
as rsync is concerned those files are "local" and rsync has no way to
compare the contents of those files other than by reading them (which
ends up transferring the whole remote file).
Stefan
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