Where did my Mac storage go?
A practical way to find out what is actually taking your disk space on a Mac, starting with what macOS tells you and ending with the folders it will not show you.
Writing
Answers you can follow without buying anything.
Everything here can be done with macOS alone. Where DiskDuo makes it quicker, it is said once at the end and not repeated.
What is “System Data” on a Mac, and how do you shrink it?
System Data is the bucket macOS uses for everything it could not classify. Here is what is usually inside it, and which parts are safe to clear.
How to free up space on a Mac, in the order that actually works
An order of operations for clearing space on macOS: the big wins first, the risky ones last, and the things not worth doing at all.
How to find duplicate files on a Mac (and why some free nothing)
What a duplicate actually is on APFS, why some copies cost no space at all, and how to remove the rest without losing the original.
How to uninstall a Mac app completely
Dragging an app to the Trash leaves most of it behind. Here is where the rest lives, and how to remove it without taking something that was never the app’s.
Or just look at your disk.
One scan, nine views, and a cleanup step that shows you everything first.