About This File
With Firedaemon you can install services to run and restart automatically when they go down/crash.
This is useful for the UT4 Hubs as well because a Hub (believe it or not) normally quits after 3 hours of inactivity.
Installing a service with Firedaemon to monitor the Hub will ensure it boots back up when this happens.
See that link for a guide how to use it for a UT4 Hub.