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MacOS Sierra has a helpful "Manage Storage" option in "About this Mac".
I noticed that my Mac uses 152 gigs of storage just for "system". I'm wondering if that's normal, because it seems outrageously high to me. I would imagine the OS would take up, certainly less than 100 gigs under normal circumstances.
Is there any way to cut down on how much storage is taken up by the system?
"System" is a bit of a catchall category; you need something that'll give more details about where all that space is going. See this previous question, and this similar one on apple.se.
– Gordon Davisson – 2016-10-19T04:45:41.940