The four storage recommendations macOS offers, and what each really does
Store in iCloud, Optimise Storage, Empty Trash Automatically, Reduce Clutter. Two of them free real space, one moves the problem, one does very little.
Open System Settings, General, Storage and macOS offers a short list of Recommendations. They look interchangeable and they are not: one genuinely deletes, one uploads and keeps a placeholder, one is a scheduled chore, and one opens a window and leaves the decisions to you.
Worth understanding before accepting any of them, because the one that sounds most dramatic is the one that frees the least.
Store in iCloud
Uploads Desktop, Documents, photos or messages to iCloud and replaces the local copy with a small placeholder that downloads on demand.
| Frees real space | Yes, but only while iCloud has room |
| Needs a subscription | Beyond the free 5 GB, yes |
| Works offline | No, a placeholder needs the network to open |
This is the recommendation to think hardest about. It converts a disk problem into a subscription and a connectivity requirement. On a laptop that is often offline, a 4 GB video that lives only in iCloud is a video you cannot open on a plane.
Optimise Mac Storage
Removes watched Apple TV purchases, and keeps only recent Mail attachments. Narrow, and useful only if you actually use those two apps heavily.
For Photos it means something different again, which is covered in what the Photos library is really holding.
Empty Trash Automatically
Deletes anything that has been in the Trash for 30 days. It frees nothing today. It is a good setting to leave on and a bad answer to a full disk.
Reduce Clutter
Opens a browser of large files, downloads and unsupported apps. Genuinely useful, and it is the only one of the four that shows you anything.
Its limit is that it lists files rather than showing proportions, so a folder of nine hundred medium files, which is what most reclaimable space actually looks like, never rises to the top. That is the gap a map fills: see reading the storage bar for why the categories cannot be opened either.
What to do instead, in order
- Turn on Empty Trash Automatically. It costs nothing and prevents the slow accumulation.
- Skip Store in iCloud until you know what is large. It is a real answer for a photo library and the wrong answer for caches.
- Use Reduce Clutter to catch the obvious single large files.
- Then look at the whole drive by size, because the biggest wins are folders rather than files.
Common questions
Do the Mac storage recommendations actually free space?
Two of the four do. Store in iCloud frees real space but moves the files to a subscription and requires a network to open them. Reduce Clutter helps you delete things yourself. Optimise Mac Storage is narrow, and Empty Trash Automatically frees nothing today.
Is Store in iCloud a good idea?
For a large photo library, often yes. For a Mac that is full of caches, build output or old device backups, no: none of those are eligible, so the recommendation cannot touch the thing that is actually filling the disk.
What does Empty Trash Automatically do?
It permanently deletes anything that has been in the Trash for 30 days. It is worth leaving on to stop slow accumulation, but it frees nothing at the moment you turn it on, and it removes your ability to recover something you trashed and forgot to check.