[Wlug] Image/Backup tools

Hi all, I'm looking for recommendations for backup/imaging tools. We have 2 servers runing RHEL4, one is a production server and the other a development server. We were recently hit with a DOS attack and possibly a root kit attack. It's been a long task re-installing all the software/tweaks we've made so I'm looking for something to ease this process if it happens in the future. Thanks in advance, Michael Z