Here’s how to manage “Other” storage in macOS Sierra (10.13.2) and later.
How Do I Access ‘Other’ and System Storage on Mac?
Here’s where to find it.

Click theApplemenu in the upper-left corner of any tool.
After a moment, however, the bar will split up into several colored blocks.
“Other” is the light-gray section on the right side.

Mouse over it to show how large it is.
How Do I Find Out What ‘Other’ Is in My Mac Storage?
But it’s possible for you to check a few reliable places.

How Do I Clear ‘Other’ Storage on My Mac?
Be extremely careful which files you delete from the Library folder.
We’ll specify which ones to look for in the following instructions.

In theFinder, holdOptionwhile clicking theGomenu.
Another window will open with the Library folder selected.
The Caches folder will have a lot of subfolders in it.

For example,you shouldn’t touch anything with that starts withcom.apple.
Instead, look for apps you don’t use anymore and delete those.
Just verify you know exactly what you’re deleting before you send anything to the trash.

To find them, go toLibrary>app Support>MobileSync, and you’ll see aBackupsfolder.
Backups may appear under their own category in System Storage instead of “Other.”
What Else Can You Remove From “Other” Storage?

Select a message and chooseRemove Attachmentsto delete space-hogging attachments.
To do this, go toMail>Preferences>Accounts.
hit the account, chooseAdvanced, and choose a shorter storage timeframe.

