OK. But how I can clone my web server. For expl. I have ISPConfig with ubuntu 9.10 and I have another server with ubuntu 9.10. And I want to mirror my primary web server with ISPConfig to my secondary. After that I have two servers with the same systems and configurations. How I can to do this? DRBD? But how to correctly clone my server without interraptions and errors, because my primary server have apr. 20 clients.