+ &recurse, /* 0 */
+ &preserve_uid, /* 1 */
+ &preserve_gid, /* 2 */
+ &preserve_links, /* 3 */
+ &preserve_devices, /* 4 */
+ &preserve_hard_links, /* 5 */
+ &always_checksum, /* 6 */
+ &xfer_dirs, /* 7 (protocol 29) */
+ &do_compression, /* 8 (protocol 29) */