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Some do and some don't. That's why you have to shop it out. A lot of people don't pay attention to this because they don't really know what SER uses, so you are ahead of the curve by asking.
One rule I use (very loose rule lol) is that 100 projects = 10 TB. So take it from there based on your setup. I'm probably a little heavy on the actual TB usage per project, but that will protect you when you are planning this thing out.