crontab -l
4 3 * * * tar -czvf /home/backup/nas_`date +%Y%m%d`.tar.gz /data/website/uploadfiles /data/website/media
4 4 * * * /bin/find /home/backup -name *.tar.gz -mtime +7 -type f|xargs rm -rf {};
chkconfig --list crond
crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off