Usually big company with huge budget in everything, have secure and complete service. Rarely seen the out of service in normal situations. However a simple mistake in maintenance could drive the fall of system badly.
There always backups system in the matter of emergency, usually not used for long periods. Rarely checks but when the trouble come, the whole part fall one by one. Like domino effect that everything connected would fall instantly.
Not like small company, usually the system failure come from outside factor. Overload requests, like virus programs to attack well protected and prepared system, so the system workload overcapacity till crush to receive the highly demand. Usually if out of service for longer periods, that means has to do with physical system.
Services have to wait all servers to be on, then restarted the service. Simple really in miscalculation in maintenance could drive the fall of service. The losses perhaps more than the values of the system itself.
Revenue in service can’t be calculated real income, processed how maintain with other business perhaps to big to be counted. Compared with for example with monthly income would be too little, since service can be longer than month. However regularly, calculated maintenance need to be carry on counter with the demand.
System crush for more than an hours is bad image to the big company. Especially with big name with a lot of users. Perhaps an apology would be not enough, someone should be responsible for the long fall.
