Back Server Issue

I have 1 linux dedicated server. I am hosting 10+ websites on it..
I am thinking about the purchsasing a new server from other host that I will use as back up server at the time of needs (when primary server goes off)..

How can this be possible? I have heard about mirror servers..

Also when I shift to new server, I will have to change the DNS on every domain with my domain registrar and that will take 48-72 hours to come into effect.. Can I change or interchange the IP (DNS settings ) of each server so that I need not have to change DNS for every domain./??

I am willing to transfer the data from one server to other weekly of fortnightly...

Please provide me with other helpful details..

Thanks

 

 

 

 

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