if i have 2 servers, how do I make one a mirror?

Im about to jump into dedicated server market since it seems all the resellers Im with say "24 backups, uptime gar..., blah, blah.." and never come through on their promises.

I want to get 2 servers, one a main server and one a "backup". I want both to be in seprate datacenters on different networks. One server will be my main server for hosting. In case this server goes down because of hardware/software problems or what ever, the second one can kick in and take over ... like a mirror site.

How can this be done?
what do I need to do this. I will be hosting many sites... i was thinking that I could backup the system every 12 hours and send the info to the second server to update.. but how could I have the servers switch when the main one goes down?

 

 

 

 

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