Found this and might be helpful to this traffic issue. In a Windows Computer you could use Glasswire on a wim to find out what traffic is going out of it:
https://github.com/zerotier/ZeroTierOne/issues/1174
https://github.com/zerotier/ZeroTierOne/issues/1018
https://github.com/zerotier/ZeroTierOne/issues/867

Same every time. Seagate is great because they are cheap, but only in numbers, you need failure protection such as raid.

One of the examples in the article is that in a jury case, someone needed to explain 10% as meaning "one in ten". I think people who really get stats do this for everything in their heads all of the time - take anything and put it into the most meaningful terms. And I think those same people would be surprised to find out that other people do not do this.