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When Disaster Recovery Plans Fail

Backup systems not valid unless regularly tested: (via PCW) Power surge at British Airways data center causes flight chaos / http://www.pcworld.com/article/3198854/backup-recovery/power-surge-at-british-airways-data-center-causes-flight-chaos.html

See also: The aftermath: (via (BBC) Why did 'power surge' hit BA computers? / http://www.bbc.com/news/technology-40118386