Hello @rizkan_abadi1 ,
You can't set up frontend and backend on a different server.
--If my answer is useful, please Accept as Solution & give Kudos
We can able to setup backend on separate node here i am sharing the link for the same - https://github.com/magento/devdocs/issues/802
But as per my experience even though its on another server node if you run the mentioned command then it makes effect on frontend as well !
Correct me if i am wrong !
Hope it helps !