I did capacity planning for a large user facing service more than a decade ago. Not only we had global N+2 redundancy (we could still serve peak traffic if we l

I did capacity planning for a large user facing service more than a decade ago. Not only we had global N+2 redundancy (we could still serve peak traffic if we lost the two largest clusters worldwide), but I also made sure we had at least N+1 per "continent". That's how I managed to get resources for us in the infamous, reserved and now long gone Budapest cluster(s), whose only other tenant was Gmail.