RSync backup script for Mac OSX from External drive

rsync_backup.sh

#!/bin/sh
echo "Running..."

PROG=$0
RSYNC="/usr/bin/rsync"

SCRIPT_MOUNTED='false'
MOUNT_VOLUME="/Volumes/Qdownload"
SRC="$MOUNT_VOLUME/transmission/completed/"
DST="/Users/tom/Dumping Ground/Qnap Downloads"

HOME="/users/tom/Development/Projects/backup"

# Mount the backup
if [ ! -e "$MOUNT_VOLUME" ]; then
  SCRIPT_MOUNTED='true'
  echo 'Mounting drive'
  mkdir $MOUNT_VOLUME
  mount_smbfs //admin:<REPLACE_PASSWORD>@192.168.1.20/Qdownload $MOUNT_VOLUME
fi

# rsync options
# -v increase verbosity
# -a turns on archive mode (recursive copy + retain attributes)
# -x don't cross device boundaries (ignore mounted volumes)
# -E preserve executability
# -S handle spare files efficiently
# --delete delete deletes any files that have been deleted locally
# --exclude-from reference a list of files to exclude

if [ ! -r "$SRC" ]; then
 MESSAGE="Source $SRC not readable - Cannot start the sync process"
 /usr/bin/logger -t $PROG $MESSAGE
 echo $MESSAGE
 exit;
fi

if [ ! -w "$DST" ]; then
 MESSAGE="Destination $DST not writeable - Cannot start the sync process"
 /usr/bin/logger -t $PROG $MESSAGE
 echo $MESSAGE
 exit;
fi

/usr/bin/logger -t $PROG "Start rsync"

sudo $RSYNC -vaE -S --progress --human-readable --force --delete --exclude-from=$HOME/rsync_excludes.txt "$SRC" "$DST"

/usr/bin/logger -t $PROG "End rsync"

#Unmount drive if script mounted it
if [ "$SCRIPT_MOUNTED"=="true" ]; then
  echo 'Unmounting drive'
  umount $MOUNT_VOLUME;
fi

exit 0

rsync_excludes.txt

.Spotlight-*/
.Trashes
/tmp/*
/Network/*
/cores/*
/afs/*
/automount/*
/private/tmp/*
/private/var/run/*
/private/var/spool/postfix/*
/private/var/vm/*
/Previous Systems.localized
/Volumes/*
*/.Trash