Preventive medicineGiven enough time, data-destroying calamities will happen but they don't have to impair the availability of data or applications in any significant way. Thus, the ultimate in DR arises when companies do not have to recover from a disaster in the traditional sense at all-and that's more than just wishful thinking. Advanced DR strategies, tactics and technologies break the life insurance mold and deliver something more akin to health insurance. They do so by providing not only the ability to recover from a disaster, but also the ability to overcome or even avoid many problems that threaten operations much more frequently than disasters.
Modern high availability (HA) software can replicate, in real-time, all production applications and data (including system data) to create and maintain hot-standby backup servers. Then, when the primary server is unavailable-regardless of whether that is due to a disaster or simply planned maintenance-users can be switched to the backup server. If a sufficient distance separates the two servers, a disaster that strikes one will not affect the other.