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One of the most significant events involving lost data since the beginning of the information technology age was the result of the terrorist attacks on Sept. 11, 2001. Of the 131 technology sites affected, only two performed a successful "Failover" to a redundant system. Of the 129 sites that failed, 70% of data was recovered after 120 hours, but 30% was lost forever. Why weren't these organizations' disaster recovery efforts more successful? First, the event was beyond the scope of most existing disaster recovery plans - no one expected an occurrence of such magnitude. Second, the complexity of the affected IT environments made testing and verification impractical if not impossible, as they were multi-vendor environments consisting of heterogeneous interdependent applications.
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