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xcopy [Dos Box]

It took a while to figure out how to recursively copy a directory with xcopy. If invoked without flags, it does not what one intends. It needs the /e and the /i flag to do that:
xcopy /e /i source_dir dest_dir 
See also xxcopy on www.cmdtools.com: a logical extension to xcopy. [Note, these links were broken on November 18th, 2005.]

Links

cygwin's rsync
cwrsync, based on rsync.
unison, similar to rsync.