QuarterRoy

Great now if they could only fix their UI from multiple issues every day.

Yes, there are many ways to do so. Most commonly you can use configuration management products, restconf/netconf, and more. Cisco routers (and many other brands) do not commit the configuration as a startup configuration until you issue a second command that commits the running config (running in memory) to the startup config. This allows the router/device to revert back if rebooted.

One point of clarification is that I don't know if Facebook uses Cisco routers for BGP. Facebook is well known for rolling its own routing stack and other services on its own servers.