I have used RSync a little myself, which also comes with Mac OS X...
It is very feature rich, including a "dry run" which is like a test
to show which files would have been updated or deleted. It's also
cool because you can ^C it any time and you didn't waste any time on
transferring files cause the next time it is run, it is as if it is
resuming.
The command I would reccommend using is
rsync -a --delete source dest
It is recommended to include -t if you choose not to use -a.
options you may find useful (from man page)
-a, --archive archive mode; same as -rlptgoD (no
-H, hard links)
-r, --recursive recurse into directories
-l, --links copy symlinks as symlinks
-p, --perms preserve permissions
-t, --times preserve times
-g, --group preserve group
-o, --owner preserve owner (root only)
-D, --devices preserve devices (root only)
-n, --dry-run show what would have been
transferred
-z, --compress compress file data during the
transfer
-i, --itemize-changes output a change-summary for all
updates
Jeff
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