There is no hard limit as such. It depends on how much data you get and how much data gets deleted. Unless you use a raspi with slow USB drives it should be much higher than 20TB. @BrightSilence estimates it with 75TB here. If you have a high success rate the limit will be higher, with a low success rate it will be lower.
But it doesn’t matter because I think you’re trolling here anyway. I doubt that you have nodes in 100 locations. Didn’t you say that leaving STORJ for Chia is 30 times more profitable 2 years ago?
Yet for some reason you’re still around here…