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by sneak 1614 days ago
Install Little Snitch, and disable the built in allow rules for all of the Apple and iCloud stuff.

Each time an Apple process tries to connect, make a rule that says that app is never allowed to connect to any server, and set the rule lifetime to "forever". There are about 20-30 Apple processes in macOS that phone home even if you don't use iCloud, iMessage, or FaceTime, or the App Store. Once you block all of them your computer will be quiet on the network.