So I found the command which the package was using "bsdtar".
I created a small script to generate the backup files and set up a cron job to run the backup every evening.
Finally I set up rsync to create backed up files of the backup file on a separate server.
mv -v pfsense_backup.tar.gz pfsense_backup_old.tar.gz
bsdtar -c -z -f /home/user/backup/pfsense_backup.tar.gz /cf/conf /var/db/rrd /usr/local/bandwidthd /var/squid/logs /var/lightsquid/report
0 2 * * * root /bin/sh /home/user/pfsense_backup.sh
Hope this helps someone out