Note: if the user launching rsync is root then the -o (preserve
uid) and -D (preserve devices) options are also implied.
-dit(bf(-r, --recursive)) This tells rsync to copy directories recursively.
+dit(bf(-r, --recursive)) This tells rsync to copy directories
+recursively. If you don't specify this then rsync won't copy
+directories at all.
dit(bf(-R, --relative)) Use relative paths. This means that the full path
names specified on the command line are sent to the server rather than
side that aren't on the sending side. Files that are excluded from
transfer are excluded from being deleted unless you use --delete-excluded.
+This option has no effect if directory recursion is not selected.
+
This option can be dangerous if used incorrectly! It is a very good idea
to run first using the dry run option (-n) to see what files would be
deleted to make sure important files aren't listed.