Quote:
Originally Posted by haertig
--ignore-existing will cause rsync to NOT copy a modified file over an earlier version of itself that is already on the backup side. This behavior would be a disaster when copying Calibre via rsync, as the metadata files can change frequently. You would want the newest one, not the oldest.
It is rare that you want this "prefer older version over newer version" behavior.
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I've never seen the option being used. Basically you only get entirely new files sent and no updates at all.