Originally Posted by
eglnyt
There is a big difference between a functional backup & a truly independent backup. The latter implies different software from the main. I don't know any ANSP that has a truly independent backup capable of handling the same traffic as the main. If you just have a second copy of the main then when you feed it the same data it will do exactly the same.
Writing and testing the software once is hard enough. Writing and testing a second, different, version that does the same thing would be "interesting". Now throw in the need to keep both systems current with evolving user demands and constantly changing data within the system, Then add the demands of upgrades to the hardware and software from the manufacturers and the associated testing. Finally it has to work and it has to make money. Hands up who wants to be the manager answerable to the CEO for that.