When operations have no margin for error, high-availability systems are the solution. The TrueNAS Ultimate-HA puts two TrueNAS appliances in an active-passive configuration, allowing the second appliance to immediately become active should the first appliance experience a fault. The seamless transition is totally transparent to other systems connected via the network. Even if the system is never called into use, the additional peace of mind it brings will allow for freer and more solid planning, as you can trust your files to always be there.