Not enough space to update macOS: how much you need and how to get it
Check the requirement for your update, check your free space, then make room with the safe steps first.
Guides
Practical guides to Mac storage: what’s safe to delete and how to get the space back.
Articles, page 6
Startup disk full on Mac: what to do first
Do the safe things first: empty the Trash, check Downloads and large files. Do not delete system folders. Here is the order.
Mac storage full? Find what is using it and free up space safely
Look first, delete second. How to see what is using your Mac's storage, which things are safe to remove, and which to leave alone.
DaisyDisk alternatives in 2026
If DaisyDisk is not what you are after, here are other ways to see where your Mac storage went, with sourced prices.
Disk space analyzers for Mac compared (free and paid)
A disk space analyzer draws a map of your storage so you can see what is big. Here is how the common ones differ, with sources.
Can I delete the Application Support folder?
Application Support holds the settings and data of your apps. Remove a folder only after identifying all its consumers and checking that its retained data is unwanted or safely exported/backed up.