On Jun 12, 5:35 pm, sheamon wrote:

Salt Lake City became overloaded and stopped accepting new flight
plans for a while. The system was restored by afternoon but processing
slower than normal as it worked on catching up on the backlog of
flight plans."

Redundant systems are great (it's my IT job to manage one), however
they do need to be designed so that the backup sites can at least meet
normal workloads.