백업
ex)
fsarchiver -j32 -o -A savefs a.fsa /dev/sda1

복구
ex)
fsarchiver -j32 -o -A restfs a.fsa id=0,dest=/dev/sda2



replication 후에는
/etc/fstab
/etc/hostname
/etc/network/interfaces OR /etc/netplan/50-......
ssh port
변경해 주어야 함

fail2ban 설치할 것
/etc/kernel/postinst.d/zz-update-grub  수정
자동업데이트방지 -->>> http://cslab.cbnu.ac.kr/board/bbs/board.php?bo_table=libfaq&wr_id=237&sfl=wr_subject%7C%7Cwr_content&stx=kernel&sop=and
ge.sh 새로 만들어줄 것