Upgrading from 10.1.23.6 to 10.4.0.10, anyting I need to know?

I am planning to finally update our farm so we can use 3dsmax 2025 (from 2023) Which means I need to update the repository on the server (windows server 2019) from 10.1.23.6 to 10.4.0.10.

Are there any pitfalls I need to be aware of, or should it be smooth sailing? Just run the 10.4.0.10 installer and install over 10.1.23.6?
This is the first time I am going to upgrade Deadline since I installed and configured it, so I am a little apprehensive (especially since I saw a thread that had client db issues from 10.2.1.1 to 10.40.0.10 (something about having to update the mongoDB))

Is there a way to either backup the current config so I can at least go back if something goes wrong, or to roll the config backup over a complete fresh install of 10.40.0.10 in case of pandemonium?

Just install it normally.

You mean as in just run the installer, use existing mongoDB when getting the choise and such and let it install over / update the existing installation/