Problem with backup script

#!/bin/sh
#Setup directory
BACKUPDIR=`date +%d`'-'`date +%m`'-'`date +%y`'--'`date +%T`

#Create directory
mkdir /backup/acornbackup/html/$BACKUPDIR/
chown acorn:acorn /backup/acornbackup/html/$BACKUPDIR
chmod 655 /backup/acornbackup/html/$BACKUPDIR

#Rsync data to new directory
rsync -a /home/acorn/public_html /backup/acornbackup/html/$BACKUPDIR/

OLD=`date +%d --date='1 day ago'`'-'`date +%m --date='1 day ago'`'-'`date +%y --date='1 day ago'`'--'`date +%T --date='1 day ago'`
cd /backup/acornbackup/html
for file in $OLD
do
        if [ ! -e "$file" ]
        then
                continue
        else
                rm -Rf $file
        fi
done

find /folder/ -type d -ctime 24 -exec rm -rf {} \;