+dit(bf(--ignore-non-existing)) This tells rsync to skip updating files that
+do not exist yet on the destination. If this option is combined with the
+bf(--ignore-existing) option, no files will be updated (which can be useful
+if all you want to do is to delete missing files). Note that in older
+versions of rsync, this option was named bf(--existing), so this older
+name is still accepted as an alias.