which already exist and have the same checksum and size on the
receiver are skipped. This option can be quite slow.
-dit(bf(-a, --archive)) This is equivalent to -rlptg. It is a quick way
+dit(bf(-a, --archive)) This is equivalent to -rlptgoD. It is a quick way
of saying you want recursion and want to preserve everything.
-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. If you don't specify this then rsync won't copy
directories at all.