Server prerequisite space?

I’m trying to determine the exact space necessary for a functional intallation to tell whether we have enough space on our current server (which also hosts our web site) or whether we’ll have to spin up a new one with more space.

What is the full functional size of this installation?

We use lots of large image files and PDFs which we’ll need to save to client entries; how much can we save through Suite? Are there any side effects of running out of space?