When creating a second Backup box, install minimal system, use the dpkg –get/set-selctions and apt-get dselect-upgrade
use cp -a to copy the following folders/files; NOTE: Avoid copying the whole folder, as fstab / passwd / udev etc. may be different (causing boot failure.)
- /etc/ppp/
- /etc/ppp/*secret*
- /etc/ppp/options*
- /etc/ppp/resolv.conf
- /etc/ppp/peers/
- /etc/postfix/
- /etc/squid[3]/
- /etc/apache2/
- /etc/openvpn/
- /etc/bind/
- /etc/samba/
- /etc/defaults/
- /etc/webalizer/
- /etc/network/if-up.d/
- /etc/ssh/sshd_config
- /etc/vim/vimrc
- /etc/pptp.conf
- /etc/vsftpd.conf
- /etc/ntp.conf
- /etc/cron.*/
- /usr/local/[s]bin
- /etc/.git/
- /etc/.gitignore
- /etc/.etckeeper
- /etc/resolv.conf
- /etc/network/interfaces
- Merge passwd and group and shadow
