Ubuntu proxy backup script

#!/bin/bash
#
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# Proxy Backup Script
#
# by Jaime Rosario Justicia
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#
#
#
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# Variables
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day=$(date +%Y-%m-%d)
ETC_DG=/etc/dansguardian
TARGZ=proxy-backup-"$day".tgz
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# Files included for the backup
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include_files="/etc/apache2 /etc/bind /etc/cron.d/update-motd /etc/crontab $ETC_DG $ETC_DG/languages/ukenglish /etc/default/locale /etc/dhcpd/dhcpd.conf /etc/fstab /etc/group /etc/gshadow /etc/host.conf /etc/hostname /etc/hosts /etc/init.d /etc/iptables.up.rules /etc/krb5.conf /etc/localtime /etc/mime.types /etc/network/interfaces /etc/nsswitch.conf /etc/resolv.conf /etc/samba /etc/squid3 /etc/ssh /etc/syslog.conf /etc/timezone /usr/share/squid3/errors/templates/ /var/www"
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# Files excluded from the backup
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exclude_files=$(echo -e --exclude "'"*.20*"'" --exclude "$ETC_DG/authplugins" --exclude "$ETC_DG/contentscanners" --exclude "$ETC_DG/downloadmanagers" --exclude "$ETC_DG/languages/arspanish" --exclude "$ETC_DG/languages" --exclude "$ETC_DG/lists/blacklists" --exclude "$ETC_DG/lists/contentscanners" --exclude "$ETC_DG/lists/downloadmanagers" --exclude "$ETC_DG/lists/phraselists" --exclude "/home/$SUDO_USER/proxy-backup*" --exclude "/var/www/squid-reports" --exclude "'"*.tgz"'" )
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# Update and cleanup of IPTables and Dansguardian
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iptables-save > /etc/iptables.up.rules
find "$ETC_DG" -name '*.20*' -execdir rm {} \;
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# Starts the backup
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tar cvfz /tmp/"$TARGZ" "$include_files" "$exclude_files"
mv /tmp/"$TARGZ" /home/"$SUDO_USER"/