“Without Time Machine, we simply would not have been able to accomplish this testing or training as it would have been way too much work and the wrong dates would have been seen in the program. Microsoft’s Active Directory essentially prohibits us from being able to move the system clock …

"We could not have completed sufficient testing without Time Machine; it has given us the confidence that the long-term scenarios are working as designed. There were no feasible alternatives but in saying that, Time Machine did all that we have expected and helped us deliver a very complex programme."