User Data Storage

Hi, I have a couple of questions that hopefully you can help me with.

I'm designing a scalable architecture using WordPress and I'd like to ensure that if a front-end user is moved to another instance (server), thier H5P data (user input, course progression, analytics, etc) will be available to them. Session data from WordPress isn't a concern here, as I can attach it to the user.

In regards to the H5P plugin for WordPress, is all of the front-end user's data stored in the database or is some of it stored locally?

I've been testing multiple scenarios with the H5P plugin files being stored and served from the instance or from a 3rd party storage. Can you tell me if there will be any changes made to these files based on a front-end users input?

I'm getting mixed results currently and I'd like to be sure before moving forward with the design.