Solid-state storage (SSD) is fantastically fast, but its high cost means that Macs with built-in SSD startup drives have a much lower capacity than their hard disk-based counterparts. This can be a problem if you have a large collection of photos or music files, or if you use your Mac to edit video. And so, if you have an SSD, you probably spend a lot of time checking the Storage tab in About this Mac. One thing you'll have noticed is that colored bar labeled ‘System'. What is it and how do you clear it? Read on and find out.
See the devices connected to your Mac You can view icons for hard disks, external disks, CDs, DVDs, iPhone, iPad, iPod touch, and connected servers in the Finder sidebar or on your desktop. From here, you should see a number of options that could help clear out the storage space on your Mac. That includes storing files and photos in iCloud, optimizing storage by clearing out email attachments and media content, emptying the trash automatically and reducing clutter.
Why does the system take so much space on Mac?
Your system is mainly stored in both the System and Library folders. If your system is taking up too much disk space on Mac, explore those two folders and see what's stored in them.
If you're having a lot of your space allocated for 'system,' you may have Time Machine snapshots stored on your Mac. Later in this article, we're going to explain how to remove Time Machine backups.
How to reduce system storage on Mac
1. Check for unnecessary files in System storage
Much of the storage space used by the OS for system-related tasks is cleared when macOS deletes the files automatically, but sometimes that doesn't happen, which is why the System category can grow very large. Apple doesn't explain what comprises this category of storage, but it's likely that the following are part of it:
- Time Machine backups
- Old iOS backups
- File Vault files
- App cache files
- Unused disk images
Not knowing what files are included in System storage makes finding them tricky. However, it's far from impossible. My favorite tool for clearing unnecessary system junk from my Mac is CleanMyMac X. It has lots of tools for clearing out junk files, but for our purposes, there's one that really helps: System Junk. This handy utility scans your Mac and identifies things like temporary files, translation files in apps, broken preferences files, old updates, and system cache files that are no longer needed. You can then remove them with one click. Or you can choose which ones you want to get rid of and remove just those. If you want to give it a go, you can download a free version of CleanMyMac X here.
Once you've downloaded and installed it, do this:
- Launch CleanMyMac X.
- Choose System Junk in the sidebar.
- Press Scan.
- Once it's finished, if you're happy to remove the files CleanMyMac recommends, press Clean.
- If not, choose Review Details and go through the list of results.
- Uncheck the box next to any items you don't want to delete.
- Press Clean.
As you can see from the screenshot, the app offers to remove my Unused Disk Images (the remains of DMG installers), broken downloads, old app updates. If you use Photoshop or other media editor you'll see the option to delete Document Versions — intermediate edits of your files. In other words, you have many options for freeing up space at your disposal.
2. Manually remove Time Machine backups
Aside from using CleanMyMac X, one of the most straightforward ways to clear system storage on a Mac, is to get rid of Time Machine backups. Wait, what? You thought Time Machine backups were stored on an external or network drive? They are! But macOS also keeps a copy of your backup on your startup drive, in case the external drive isn't available when you need to restore files. That way you can restore data on a MacBook even when you're on the move.
macOS should delete Time Machine backups when your Mac runs low on storage, but it doesn't always work out that way. And besides, you might not want to wait until your Mac is short of space before you delete them. So, here's how to reduce system storage on a Mac by deleting Time Machine backups. Remember that will delete local copies of your backups, so if you think you might need them, don't do it.
- Go to Applications>Utilities and launch Terminal.
- When a Terminal window opens, type:
tmutil listlocalsnapshotdates - Press Return.
You will now see a list of stored Time Machine backups, listed by date.
- Type:
tmutil deletelocalsnapshots xxxxxxxwhere ‘xxxxxxx' is the name of one of the backups listed . This will take the form of a date followed by a text string. - Press Return.
- Repeat steps 1 and 2 for as many backups as you want to remove, checking the Storage tab in About this Mac each time to see how much space you've cleared.
3. Optimize your storage
If you've faced a cluttered storage situation, there's another way to fix it. Apple has anticipated such an issue and equipped the macOS with some features to optimize your space.
Go to the Apple menu and select About This Mac. Select the Storage tab and press Manage. In the window that appears, you can see some of the useful suggestions. 'Store in iCloud' lets you transfer all your data to cloud storage and reclaim some GBs on your Mac. The second option allows you to delete the heaviest files, like movies and programs.
Turning on 'Empty Bin Automatically' can be a useful option if you forget to do it regularly.
By pressing Review Files, you will jump into the Documents section. Review the files that are stored on your Mac and pay attention to the Unsupported Apps category. It can contain some programs that can no longer run on your macOS version.
Bonus tip: remove duplicate files
Aside from the bizarre system files, another thing that nibbles on your storage is duplicates. Remember that track you've accidentally added twice? Or a mail attachment you've opened several times? All these files just sit on your Mac and take up precious space.
Here's how you can quickly delete them in a few clicks.
- Download and open Gemini 2
- Choose a folder and click Scan for Duplicates
- Wait for the scan to finish
- Click Smart Cleanup to get rid of detected duplicates
Or click Review Results if you want to double-check what's being deleted.
What else can you do to reduce System storage on Mac?
Believe it or not, one thing you can do is wait. When you first choose the Storage tab in About this Mac, macOS seems to allocate quite a lot to System that it then reallocates elsewhere. For example, some users have reported that after waiting for a few minutes, much of the storage that was labeled System, is moved to the iCloud label. So if you wait, you might find that the System isn't taking up disk space in the huge quantities that it seemed to be at first.
The other thing you can do is investigate what files are designated as ‘System'. We've already talked about Time Machine backups, but everything stored in your Mac's System or Library folders comes under the ‘System' heading in About this Mac. That is:
/Library
/System
~/Library
~/System
Click on the Go menu in Finder and select Go to Folder, then paste in each of the paths above in turn. Go through the subfolders in each and press Cmd-I to Get Info and check how much data is in each. You'll quickly discover where your precious storage has gone.
It's likely that much of it is accounted for by cache files for apps like Photos and Safari. MacOS caches as much data as it can to avoid having to re-download it, which boosts performance. And it's smart enough to know that it must delete cache files when you run low on storage.
If you decide that you don't want to leave it up to the operating system to free up storage, don't just start trashing cache files or folders randomly, you might delete something you shouldn't. The best approach is to use CleanMyMac X's Smart Scan feature that will tell you what files can be safely deleted.
System storage can occupy tens of gigabytes of space on your Mac for Time Machine backups and cache files. It should be managed by macOS so you're never short of space. But if you want to do a system storage cleanup, or just free up more space on your Mac, give CleanMyMac X a go. You might be surprised by how much space you get back.
System cleanup in one click
Checking your storage on Mac isn't difficult – but managing it can be. One of the more curious storage compartments is the 'other' storage on Mac, which sounds like a catch-all for files that can't be labeled properly.
And that's sort of true! But the other volumes in container can get full, and reduce the Mac storage Other space for your Mac. And keep in mind there's no 'how to get rid of other on Mac' option; the partition isn't there to delete totally. Here we'll show you how to check your other space, and offer guidance on managing it.
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How to Check Storage on Mac
This will be quick! Just follow these directions:
- Click the Apple logo on the top left of the menu bar
- Select 'About This Mac'
- Choose 'Storage'
And there you go! That's the simple way to check the storage available on your Mac. Now, do you see that 'Manage…' button on the right-hand side of the window? Click it!
Depending on how you use your Mac and what apps you run, that 'other' category could be taking up quite a bit of space, and you could free it up very easily — potentially saving yourself from having to buy additional storage.
View and Manage the Other space on Mac
The next window you arrive at shows how Apple manages your system memory. In macOS Sierra, Apple added a default feature named 'Optimize' that helps balance the load between cloud storage and on-device memory use. As you can see in the window (below), 'System' and 'Other' are greyed-out.
This is because the other space is tricky to manage, and required digging into the Library on your Mac. As we cautioned in our article on deleting apps from your Mac, foraging through Library is a tad frightening, so proceed with caution.
Where Can I See My Mac Storage Capacity
But what is other on Mac? In essence, it's caches, plug-ins, and documents macOS wants to keep around. Here's how to open Library, so we can start to discover what 'other' is on Mac:
- Open Finder
- Select 'Go' from menu
- Hold down 'option' key on keyboard; you should see a new option for 'Library'
- While holding down the option key, select 'Library'
You'll see a Library folder in the list. Click it to see all your apps and associated files. There are also folders with names like 'Caches.'
Nox on mac os mojave. We can't caution you enough: if you're not sure what it is you're looking for, don't delete it – and remember you can't delete Other on Mac entirely. There's a reason Apple hides the Library; small changes can have deep, lasting effects.
But, if you know what needs deleting, this is where you'll find it. If you're positive an app's files or plugins need to go, this is where you'll find them. Simply right-click the folder or file you want gone, and select 'move to trash.' Then empty the trash can, and you're done. This is how you remove files from the Other storage category.
But that's scary stuff. We have a better way
The Best Way to Reduce Other Storage on Mac
Apple's Optimize service is great for Macs with tons of on-board storage, mostly because those machines need very little interaction when it comes to managing files and storage space.
How To See Mac Storage
The best option is to find a file manager you can control. ForkLift is a really solid option that brands itself as a replacement for Finder – and it's not wrong. You can connect multiple servers (FTP, SFTP, Amazon S3, AFP, WebDAV, SMB, and NFS), and archive unnecessary files or folders. Like Finder, it has a preview for files you're accessing, and also lets you compare files so you can delete duplicates as needed.
A much more robust method is with CleanMyMacX. This app is almost a must-have for any Mac owner. It managed files, folders, apps, extensions, updates, mail attachments, and the trash bin. But it's core function is to make sure your Mac is optimized, and it does an amazing job.
Reduce storage with CMM X
Install CleanMyMac X and forget about manual storage cleaning. The app wipes away all junk from your Mac in seconds.
With CleanMyMacX, all you have to do is activate its Smart Scan feature. It discovers unnecessary files for you, and optimizes your Mac for speedier performance. It even makes sure your Mac has no malware!
Trusting CleanMyMacX to do its job correctly is never a question, but you can dig deeper if you like. Once a smart scan is complete, you can select 'review details' under the Cleanup task before you select 'run.' In this details log, you'll see two main categories: system junk, and trash bins.
System Junk is where those pesky cache files are, along with log files. You can choose 'show' to see which caches CleanMyMacX is getting rid of, too.
Conclusion
The one thing to remember about other storage on Mac is it's not always going to vanish. Your Mac stores all kinds of things there, like application support and font files. You need that stuff – and is again why we caution you not to simply clear out everything in your Library that doesn't immediately resonate.
But you don't always need caches, and cleaning your files manually can take a long time. When you're ready to clear 'Other' on Mac, it's almost always because you want it to run smoother, or stay running at optimal performance levels.
This is why we advocate for apps like ForkLift and CleanMyMacX. Even if you want the more manual controls ForkLift offers, its ease of use makes storage management faster and easier.
We think most will find value in CleanMyMacX, too. Its simple one-click optimization makes system maintenance a breeze!
Best of all, both ForkLift and CleanMyMacX are available free as part of a seven day trial of Setapp. In addition to these apps, you get access to dozens of other handy macOS apps!
Meantime, prepare for all the awesome things you can do with Setapp.
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