I have two ubuntu server into my company:
1) backup server which only backup computer or remote server (IP: 192.168.1.253)
2) real server which contains all data file apache where run our demo project (IP: 192.168.1.254)
Server 2 has the firewall, server 1 no.
I want to know if I have to install firewall into the backup server or is not necessary for our security. Or a method to reject ssh connection from bot or hacker.