Why moving files to the Trash doesn’t free up space (yet)
The Trash is a folder on the same disk. Here is when the space actually comes back, why the number sometimes still doesn’t change, and how to check.
Read articleGuides to freeing up space on your Mac
What’s safe to remove, what isn’t, and how macOS storage works.
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What’s safe to delete in ~/Library/Caches
Which caches apps rebuild without trouble, which ones hold data you might miss, and what happens after removal.
Cleaning up Xcode: DerivedData, device support and old simulators
Where Xcode keeps build data, what each folder is for, and what the next build costs after you clear it.
Finding duplicate files without losing the one you need
Why matching names aren’t enough, and how to choose which copy to keep.
What apps leave behind after you delete them
Application Support, containers, preferences and launch agents: where they live and how to tell what belongs to which app.
How DiskJoy decides what to preselect
The three preselection levels, and why large files are never selected for you.