Mine

case "$1" in
        "l")
                bip="192.168.1.15";
                cpd="data";;
        "r")
                bip="katrina.selfip.net";
                cpd="";;
        *)
                bip="$1";
                cpd="$2";;
esac

echo "Beginning backup to $bip"
rsync -auz "/home/michael" "$bip:/backup/michael/"
if [ "$cpd" == "data" ]; then
        rsync -auz "/home/michael-data" "$bip:/backup/michael/"
fi
echo "Completed backup to $bip"