Free up space on your Mac
1 Find the feature
Choose > About This Mac and then click the new window’s Storage tab. This shows categorised breakdowns of used space on your Mac’s directly attached storage. There’s a Manage button next to only the current startup disk. Click it.
2 Review its suggestions
The Storage Management window opens, with Recommendations selected in its left pane. On the right, ideas of how you can save space are described, with a button next to each item. Click one for more info, then accept or ignore it.
3 Store in the cloud
The first item’s wording will suggest storing files and full-quality photos in iCloud, depending on whether you’ve already set iCloud Photo Library to keep optimised versions on your Mac if space is low (this was possible before Sierra).
4 Files in iCloud Drive
Photos obtains a full-quality copy from iCloud when you edit a picture. As for files in Drive, accepting that idea turns on a new item in iCloud Drive’s preferences that keeps only recently used files on your Mac if space gets low.
5 Movies and TV shows
The next suggestion is equivalent to turning on an item in iTunes’ Advanced preferences. It instructs iTunes to remove movies and TV episodes from your Mac after you’ve watched them, potentially saving you lots of space due to their size.
6 Auto- empty the Trash
Sierra can be set to automatically remove items that have been in the Trash for longer than 30 days. This is the same as enabling an item in Finder’s Advanced preferences. Past the grace period, items can still be recovered from Time Machine.
7 Recover lost files
As long as you haven’t excluded the Trash from Time Machine backups, open a window on the Trash in Finder and then choose Enter Time Machine from the service’s menu bar icon. Browse back in time and restore the file, like any other.
8 Reduce clutter
The fourth recommendation is the same as clicking Documents in the left pane. It can take a while for your drive’s contents to be analysed before big items appear under Large Files, where they’re listed with when they were last accessed.
9 Trash unwanted files
Select an item under Large Files, Downloads or File Browser and press the Spacebar to preview it, or ç+∫ to trash it. Be careful as File Browser is less safe than you might think; you can trash the folder that holds your iTunes library, say.