There are many technique to maintain users session data on multiple server. If you have more than one server then should have to implement web farm concept with load balancer. Where you can user OutPro session management technique like Database session/state management OR you can use Cache with File/Database dependency.

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Hi Juliana Buonanno,Thanks for the information. I will sure to inform my seniors. Thanks & RegardsJaipal Reddy

Hi you can use the NLB (Network load balancer), NLB is automatically manage the servers, if one server went down the automatically it wil rout the traffic to other server.

hi Appalaraju Marpu could you please explain in detail if you have free time.

using load balancing servers

Hi lalit thank you for your answer but my intention is not that, what i mean is when the traffic is high on one server the user will switches automatically to another server. how it is possible and how to achieve that?

Simply take back up of code and database .then migrate to another server.