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First setup everything on the new server. Get yourself another domain name for this so that you can test everything before you switch.
Once you are sure that everything is working correctly change the DNS on your domain name to point to the new server.
Wait about 4 or 5 days before you shut off your old sever once you see that the DNS is going to your new server just to be sure that it has propagated for everyone.
This will result in zero downtime.
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