Virtualisation makes your servers and applications independent of the server hardware. Virtual servers can easily be moved from one physical host server to the next.
That being the case, you can utilise spare servers for use in the event of a disaster or you may have multiple physical hosts with spare capacity available in the event one of them were to fail. Depending on your Recovery Time Objective (you’re “RTO” is the target time its takes for the systems to be useable again) and you’re Recovery Point Objective (you’re “RPO” is the desired point in time to which data is recoverable), there are number of complimentary technologies such as those from Platespin & Vizioncore that can match your requirements. Depending on where your coming from and where you want to get to, each solution will be different so please talk to us to determine the best way forward.