'rsync -a' updates the ctime on a directory even if no file in that directory has changed. A kind of workaround is to use '-O', but then the mtimes of directories are not preserved.
(Usage example where this is important: maintain a copy of filesystem A in filesystem B, and use filesystem B as the source for incremental backups (e.g., with star). rsync is run before an incremental backup is made. Because of the above described ctime problem, every incremental backup will contain *all* directories, even if filesystem A was not changed since the last sync and backup.)
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