I work at a remote site, and I often use rsync to copy Unix application directories from the corporate site, to my own.
Often these directories are minor revisions of previous installations. (ie: /base/app/1.1, /base/app/1.2 /base/app/1.2.1 ) I can make a copy of the previous directory under the new name, and then do a checksum transfer, but that may waste a lot of time, up front, in major version upgrades. Is it possible in rsync to copy from source to destination, while checking a parallel directory for possible matching files, and thus doing a quick copy at the destination, rather than across the WAN? The check could be done at the source, since the previous installation would be the same at both sites due to a previous rsync.
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