On Fri, Jan 20, 2012 at 9:15 AM, smallpox <smallpox AT gmail DOT com> wrote:
> i was under the impression that rsync does the comparison with little or
> no bandwidth.

It generally does not use a big percentage of the data, but the client
sends the full directory tree data to the server where the comparison
happens.   If you have millions of files, that's going to use some
bandwidth even you are doing incrementals and the directory comparison
shows that no timestamps have changed.  By contrast, for a tar
incremental the server would send a timestamp and the client would
only send newer files - but that misses deletions, new files that
maintain old timestamps, the new location of old files under a renamed
directory, etc., etc..

-- 
  Les Mikesell
     lesmikesell AT gmail DOT com

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