Transfer all data to external MQTT Server

Hello!
I am new to MQTT and Chirpstack. My Chirpstack is setup the following way:

(Gateways with UDP Packet Forwarder) —connect to----> Chirpstack server (Chirpstack/Chripstack Gateway Bridge/MQTT broker)

This should stay that way, but I also want to push all MQTT Data to a second server which hosts our main mqtt broker.

When i change the server adresses in chripstack.toml and chirpstack-gateway-bridge.toml my LoRa Gateways break up their connection with my Chirpstack, so i have to leave my setting in those files to localhost.

Ive researched on the internet but it gets confusing when topics are thrown in which i have no knowledge of.