Disaster Recovery has been on the minds of companies ever since the early days of commercially available computing. Today's world of DR revolves around four acronyms - BIA (business impact analysis), RPO (recovery point objective), RTO (recovery time objective) and BCP (business continuity plan). The acronyms appear in a disaster recovery plan in roughly in that order, the thinking being that you first analyse the impact to business of systems being down, then figure out how far back in the past are you willing to turn the dial back to recover from (last day, last hour, last millisecond). Next focus on how long you can afford to be down. Finally - buy a boatload of hardware, software and services to convert all this into action. Setting up a DR is a hugely expensive affair that takes a significant amount planning and effort, not to mention all those drills and tests every now and then. CTOs have followed this prescription since the late seventies (apparently the first hot site wa...
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