Howard Miller

"...but there is no "recommended architecture plan" telling exactly how is this supposed to be setup?"

and there is never going to be as there are too many variables.

If you are coming at this from a standing start then you have a BIG problem. There are one or two Moodle Partners who might be able to help you but that's about it. Failing that, I would always recommend starting out with a smaller pilot and gaining some real-world experience.

I hope you don't mind, but I'm going to move this to the Lounge.

To be clear... you're trying to find large files submitted to current Assignments?

Why? Is this just for academic interest or because you plan to do something? I ask because it may affect what information you need to find.

I don't know why you're worried about assignments. In my experience, they're mostly small Word files.

The best plan is to have a policy for deleting old/unused courses. That settles it.

That's just a picture of the plugins administration page.

I'm pretty sure that you're going to need site admin capability to see that.