cp -p /etc/hosts /etc/hosts_`date +%F_%T | sed 's/[:-]/_/g'`

cp -p /etc/crontab /etc/crontab_`date +%F_%T | sed 's/[:-]/_/g'`

cp -p /etc/sudoers /etc/sudoers_`date +%F_%T | sed 's/[:-]/_/g'`

cp -p /etc/ssh/sshd_config /etc/ssh/sshd_config_`date +%F_%T | sed 's/[:-]/_/g'`