You're gonna love this, here's what it comes up with:

rsync version 2.6.0 protocol version 27
Copyright (C) 1996-2004 by Andrew Tridgell and others
HFS+ filesystem support for OSX (C)2004 Kevin A. Boyd
<http://rsync.samba.org/>
Capabilities: 64-bit files, socketpairs, hard links, symlinks, batchfiles,
IPv6, 32-bit system inums, 64-bit internal inums

rsync comes with ABSOLUTELY NO WARRANTY. This is free software, and you
are welcome to redistribute it under certain conditions. See the GNU
General Public Licence for details.

rsync is a file transfer program capable of efficient remote update
via a fast differencing algorithm.

Usage: rsync [OPTION]... SRC [SRC]... [USER@]HOST:DEST
or rsync [OPTION]... [USER@]HOST:SRC DEST
or rsync [OPTION]... SRC [SRC]... DEST
or rsync [OPTION]... [USER@]HOST::SRC [DEST]
or rsync [OPTION]... SRC [SRC]... [USER@]HOST::DEST
or rsync [OPTION]... rsync://[USER@]HOST[:PORT]/SRC [DEST]
or rsync [OPTION]... SRC [SRC]... rsync://[USER@]HOST[:PORT]/DEST
SRC on single-colon remote HOST will be expanded by remote shell
SRC on server remote HOST may contain shell wildcards or multiple
sources separated by space as long as they have same top-level

Options
-v, --verbose increase verbosity
-q, --quiet decrease verbosity
-c, --checksum always checksum
-a, --archive archive mode, equivalent to -rlptgoD
-r, --recursive recurse into directories
-R, --relative use relative path names
--no-relative turn off --relative
--no-implied-dirs don't send implied dirs with -R
-b, --backup make backups (see --suffix & --backup-dir)
--backup-dir make backups into this directory
--suffix=SUFFIX backup suffix (default ~ w/o --backup-dir)
-u, --update update only (don't overwrite newer files)
-l, --links copy symlinks as symlinks
-L, --copy-links copy the referent of symlinks
--copy-unsafe-links copy links outside the source tree
--safe-links ignore links outside the destination tree
-H, --hard-links preserve hard links
-p, --perms preserve permissions
-o, --owner preserve owner (root only)
-g, --group preserve group
-D, --devices preserve devices (root only)
-t, --times preserve times
-S, --sparse handle sparse files efficiently
-n, --dry-run show what would have been transferred
-W, --whole-file copy whole files, no incremental checks
--no-whole-file turn off --whole-file
-x, --one-file-system don't cross filesystem boundaries
-B, --block-size=SIZE checksum blocking size (default 700)
-e, --rsh=COMMAND specify the remote shell
--rsync-path=PATH specify path to rsync on the remote machine
--existing only update files that already exist
--ignore-existing ignore files that already exist on receiving side
--delete delete files that don't exist on the sending side
--delete-excluded also delete excluded files on the receiving side
--delete-after delete after transferring, not before
--ignore-errors delete even if there are IO errors
--max-delete=NUM don't delete more than NUM files
--partial keep partially transferred files
--force force deletion of directories even if not empty
--numeric-ids don't map uid/gid values by user/group name
--timeout=TIME set IO timeout in seconds
-I, --ignore-times turn off mod time & file size quick check
--size-only ignore mod time for quick check (use size)
--modify-window=NUM compare mod times with reduced accuracy
-T --temp-dir=DIR create temporary files in directory DIR
--compare-dest=DIR also compare destination files relative to DIR
--link-dest=DIR create hardlinks to DIR for unchanged files
-P equivalent to --partial --progress
-z, --compress compress file data
-C, --cvs-exclude auto ignore files in the same way CVS does
--exclude=PATTERN exclude files matching PATTERN
--exclude-from=FILE exclude patterns listed in FILE
--include=PATTERN don't exclude files matching PATTERN
--include-from=FILE don't exclude patterns listed in FILE
--files-from=FILE read FILE for list of source-file names
-0 --from0 all *-from file lists are delimited by nulls
--version print version number
--daemon run as a rsync daemon
--no-detach do not detach from the parent
--address=ADDRESS bind to the specified address
--config=FILE specify alternate rsyncd.conf file
--port=PORT specify alternate rsyncd port number
--blocking-io use blocking IO for the remote shell
--no-blocking-io turn off --blocking-io
--stats give some file transfer stats
--progress show progress during transfer
--log-format=FORMAT log file transfers using specified format
--password-file=FILE get password from FILE
--bwlimit=KBPS limit I/O bandwidth, KBytes per second
--write-batch=PREFIX write batch fileset starting with PREFIX
--read-batch=PREFIX read batch fileset starting with PREFIX
--showtogo display how many files left to rsync until done
--eahfs rsync with extended HFS+ attributes
-h, --help show this help screen
-4 prefer IPv4
-6 prefer IPv6


Please see the rsync(1) and rsyncd.conf(5) man pages for full documentation
See http://rsync.samba.org/ for updates, bug reports, and answers
rsync error: syntax or usage error (code 1) at main.c(1012)

Thats good,

there must be a problem when the script was pasted.

run this:

cat ~/backup.sh > Desktop/backup.txt

Goto you desktop open the txt file and past the contents here.