If rsync has been told to collapse symlinks (via bf(--copy-links) or
bf(--copy-unsafe-links)), a symlink to a directory on another device is
-treated as a mount point, while other referents are treated as though they
-existed on the device where the symlink is found.
+treated like a mount-point. Symlinks to non-directories are unaffected
+by this option.
dit(bf(--existing, --ignore-non-existing)) This tells rsync to skip
updating files that do not exist yet on the destination. If this option is