This builds redundancy into the system, meaning that if some fragments become corrupted, the data will not be lost.

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And you have a certain amount of redundancy in the system as well in terms of storage you can remove, a place where pictures and backup files can reside, and a way for files to be moved around without having to play around with cables or network connections.

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These include a partial redundancy of its IT system and a write-off of development costs on its traditional build centres.

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And surely, with the right kind of redundancy built into the system, the extent to which this will matter will be minimised.

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Everyone wants redundancy, no one wants their system down.

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Since the system has a 20 percent redundancy, packages are dynamically rerouted to the right loading area when part of the building's conveyor intestines fail.

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But the overall air system's safety is built on redundancy, and taking away the controller's extra set of eyes is like removing stop signs or traffic lights from city intersections and forcing drivers to be more vigilant and cautious, says Paul Rinaldi, president of the National Air Traffic Controllers Association.

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He added that the current system was far more generous than the statutory redundancy payments available to most low-paid people in the private sector.

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All four of the new systems include full hardware redundancy, redundant storage and network connections and allow for live operating system upgrades, Sun said.

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