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How far is far enough depends on the organization. One can look at this in terms of financial outlay. The amount expended on disaster recovery will vary according to how critical availability is to the orgainization concerned. The extent of geographical coveraget will also be controlled by the contirbutions of the locations to the IT infrastructure. I beleive you also need to look at the first answer above. What does FAR mean? Is it distance, Funding or Coverage? One can also look at the recovery time .....
There are two kinds of distance you need to consider in disaster recovery, Physical and Topological.
Physical - A site should be located in an area where it will not affect your data center in case of a disaster. If you’re in an earth quake zone, hurricane area, you should not put your DR site in the same location. For example if you have a data center on the US East coast, then it’s safe to your DR somewhere in the middle of the country.
Topological - That is the “distance” between your data center and the DR center in terms of response time, including bandwidth. Unlike physical distance, you want to minimize the topological distance to increase network performance. It does not help, if you have your DR site in the safest place while internet connection is unreliable and bandwidth is a challenge
Hope this helps.
Disaster Recovery depend on your how your data valuable to You. the more Precious data the more you care about,(cost Reduction) and your Financial statement are Effictive Factors Here.
