Simple rsync MC Backup

#!/bin/bash

mcuser=username
scrname=minecraft
mcb=/mcbackups/sdom/backups_hourly
src=/home/username/server/
screen=/usr/bin/screen
#exclude='backups/*'
#exclude='database.db'
exclude='logs/'
iterations=24

mcprocess=$(ps -eaf | grep java | grep sdomserver | awk '{print $1}')
if [ "$mcprocess" == "$mcuser" ]; then
   $screen -d -r $scrname -p 0 -X stuff "$(printf '\r')"
#   $screen -d -r $scrname -p 0 -X stuff "say Initiating Hourly backup! $(printf '\r')"
   $screen -d -r $scrname -p 0 -X stuff "save-off $(printf '\r')"
   $screen -d -r $scrname -p 0 -X stuff "save-all $(printf '\r')"
   sleep 1
fi

cd $mcb
oldest=`printf "%03g" ${iterations}`
if [ -e minecraft.${oldest} ]; then rm -rf minecraft.${oldest}; echo Removing ${oldest}; fi
start=`expr ${iterations} - 1`
for i in `seq -f "%03g" ${start} -1 0`; do
   oneup=`expr ${i} + 1`
   oneup=`printf "%03g" ${oneup}`
   if [ -e minecraft.${i} ]; then mv minecraft.${i} minecraft.${oneup}; echo Moving ${i} to ${oneup}; fi
done
if [ -e minecraft.001 ]; then
   rsync -a --exclude=$exclude --delete --link-dest=$mcb/minecraft.001 $src $mcb/minecraft.000/
else
   rsync -a --exclude=$exclude --delete $src $mcb/minecraft.000/
fi

if [ "$mcprocess" == "$mcuser" ]; then
   $screen -d -r $scrname -p 0 -X stuff "save-on $(printf '\r')"
#   $screen -d -r $scrname -p 0 -X stuff "say Hourly backup complete! $(printf '\r')"
fi