mirror as a means to mirror machines

Hello folks: I am running a single server hosting several domains, websites, email and email lists etc. I am a bit nervous about have a catastrophic failure that takes the service down for as long as it takes me to rebuild things from backups. I have a second box running the same version of SuSE. I thought it would be cool to be able to have an automated method that keeps the second box ( secondary backup box ) updated with the current files on the main server. Any suggestions how to achieve this? Could it be as simple as using the "mirror" program? Rsync? -Jim-