Some days ago, I found one Reddit user’s post telling the “System” taking up a huge space on Mac. It was the first time I met the Mac “System” storage problem. And it was described as follow:

Hi Mac Users, System is taking an incredibly large amount of space. I mistakenly loaded heavy video files to Numbers and the hard disk immediately filled up. Any help accorded will be highly appreciated.

About this Mac includes a storage feature to see a snapshot of your storage usage, but it also offers up recommendations to free up space and more. Head to → About this Mac. Dumping old downloads is a tried-and-true way to reduce clutter on your Mac and free up disk space for your vacation photos and other useful files. Here’s how to do it: Open Finder. Select Downloads on the left. Right-click the useless files and select the Move to Trash option from the drop-down menu. Empty the Trash.

After I checked my computer storage usage and I was surprised to find my “System” is also taking an incredibly huge space – 43GB of the total 120GB on my MacBook Air.

As well known, the Mac operating system usually takes up from 8GB to 13GB. So I don’t think my Mac “System” storage could be that huge, so I searched to find how it defines “System” storage for a Mac, and how to free up that storage.

What is in the Mac “System” Storage?

The “System” on your Mac storage bar stands for that space your macOS operating system used, including the system itself and the caches and cookies it generated while driving on your computer hard drive.

Sometimes, your Mac may mistakenly put other sections into the “System” storage. For instance, my mac made the mistake of failing to exclude the “Music creations” and “iOS files” (iOS backups) from the “System” storage, so that I get a huge “System” on the storage bar.

And after I clicked the Manage.. button on the top left of the bar, it showed the real system storage was taking only 29.3 GB. And there were two new categories named “iOS files” and “Music creations” being separated.

Get rid of everything else from Other disk space. Even Other storage space has its own “other” files, and no, the irony of that statement is not lost on us. Other storage on Mac can also include: Files in your user library (screen savers, for example). Files Spotlight search doesn’t recognize. If you wish to free up space on Mac, then check for any duplicate content and get rid of unwanted files. Mostly, users observe the presence of duplicate photos on Mac. To analyze this, go to Finder Pictures from the sidebar.

And the sum of the storage size of these three parts (System, Music Creation, and iOS Files) is 43.38GB, equal to the size of the huge System storage I showed before on the storage bar.

4 Tips to Quickly Clean Storage on Your Mac

On the storage manager page, you’ll have a detailed view of all data types with the size it used. And you can choose any large category to have a clean. And below are some usual and free methods to free up your Mac storage.

1. Delete useless iOS backup files, applications, and documents.
2. Transfer media files like photos, video, music, and iBooks to external disk drive or cloud. And then delete them.
3. Empty your Trash bin get more free space.
4. Remove your iPhone or iPad software updates on your Mac.

Most of these methods aim to remove the larger files on your Mac to quickly free up your Mac storage. And if there is any question, please leave your comment below.

Optimised Storage in macOS Sierra and later* can save space by storing your content in iCloud and making it available on demand. When storage space is needed, files, photos, films, email attachments and other files that you rarely use are stored in iCloud automatically. Each file stays exactly where you last saved it, and will download when you open it. Files that you’ve used recently remain on your Mac, along with optimised versions of your photos.

* If you haven't yet upgraded to macOS Sierra or later, learn about other ways to free up storage space.

Find out how much storage is available on your Mac

A Network Attached Storage device can provide shared storage, a Time Machine backup target, and additional useful features for Mac, iPhone, and iPad users on a local area network — and beyond.

Apple app store free download - Apple iTunes, Apps Store for Microsoft Office, Your app in the store for Windows 10, and many more programs. Easy Navigation to the Apps - Built-In support of File Explorer in Launcher For Mac OS Style - Create Folders, Cut, Copy, Paste, Move, Share etc. Listing of all of your drives, SD Card, Storage, audio and video files and pictures in PC style. Picking the Best Cloud Storage Service for Mac. Apple has transitioned most of its computers — especially MacBooks — from HDD to SSD in order to provide users with thinner devices and faster. If you purchased them outside the Mac App Store, just be sure you’ll have a way to obtain them again in the future if you need to (or you can transfer them to an external drive if you’d like.

Choose Apple menu  > About This Mac and then click Storage. Each segment of the bar is an estimate of the storage space used by a category of files. Move your pointer over each segment for more detail.

Click the Manage button to open the Storage Management window, pictured below. This button is only available in macOS Sierra or later.

Manage storage on your Mac

The Storage Management window offers recommendations for optimising your storage. If some recommendations have already been turned on, you will see fewer recommendations.

How To Free Up Space On Mac

Store in iCloud

Click the Store in iCloud button and then choose from these options:

• Desktop and Documents. Store all files from these two locations in iCloud Drive. When storage space is needed, only the files you recently opened are kept on your Mac, so that you can easily work offline. Files stored only in iCloud show a download icon , which you can double-click to download the original file. Learn more about this feature.
  
• Photos. Store all original, full-resolution photos and videos in iCloud Photos. When storage space is needed, only space-saving (optimised) versions of photos are kept on your Mac. To download the original photo or video, just open it.
  
• Messages. Store all messages and attachments in iCloud. When storage space is needed, only the messages and attachments you recently opened are kept on your Mac. Learn more about Messages in iCloud.

Storing files in iCloud uses the storage space in your iCloud storage plan. If you reach or exceed your iCloud storage limit, you can either buy more iCloud storage or make more iCloud storage available. iCloud storage starts at 50 GB for $0.99 (USD) a month, and you can purchase additional storage directly from your Apple device. Learn more about prices in your region.

Optimise Storage

Click the Optimise button, then choose from these options.

• Automatically remove watched films and TV programmes. When storage space is needed, films or TV programmes that you have purchased from the iTunes Store and have already watched will be removed from your Mac. Click the download icon next to a film or TV programme to download it again.
  
• Download only recent attachments. Mail automatically downloads only the attachments that you have recently received. You can manually download any attachments at any time by opening the email or attachment, or saving the attachment to your Mac.
  
• Don't automatically download attachments. Mail only downloads an attachment when you open the email or attachment, or save the attachment to your Mac.

Optimising storage for films, TV programmes and email attachments doesn't require iCloud storage space.

Empty Bin Automatically

Empty Bin Automatically permanently deletes files that have been in the Bin for more than 30 days.

Reduce Clutter

Reduce Clutter helps you to identify large files and files you may no longer need. Click the Review Files button and then choose any of the file categories in the sidebar, such as Applications, Documents, Music Creation or Bin.

You can delete the files in some categories directly from this window. Other categories show the total storage space used by the files in each app. You can then open the app and decide whether to delete files from within it.

Best media software for mac. Learn how to re-download apps, music, films, TV programmes and books.

Where to find the settings for each feature

The button for each recommendation in the Storage Management window affects one or more settings in other apps. You can also control these settings directly within each app.

• If you're using macOS Catalina, choose Apple menu  > System Preferences, click Apple ID, then select iCloud in the sidebar: Store in iCloud turns on the Optimise Mac Storage setting on the right. Then click Options next to iCloud Drive: Store in iCloud turns on the Desktop & Documents Folders setting. To turn off iCloud Drive entirely, deselect iCloud Drive.
  In macOS Mojave or earlier, choose Apple menu > System Preferences, click iCloud and then click Options next to iCloud Drive. Store in iCloud turns on the Desktop & Documents Folders and Optimise Mac Storage settings.
• In Photos, choose Photos > Preferences and then click iCloud. Store in iCloud selects iCloud Photos and Optimise Mac Storage.
• In Messages, choose Messages > Preferences, then click iMessage. Store in iCloud selects Enable Messages in iCloud.

• If you're using macOS Catalina, open the Apple TV app, choose TV > Preferences from the menu bar and then click Files. Optimise Storage selects “Automatically delete watched films and TV programmes”.
  In macOS Mojave or earlier, open iTunes, choose iTunes > Preferences from the menu bar and then click Advanced. Optimise Storage selects “Automatically delete watched films and TV programmes”.
• In Mail, choose Mail > Preferences from the menu bar and then click Accounts. In the Account Information section on the right, Optimise Storage sets the Download Attachments menu to either Recent or None.

Empty Bin Automatically: From the Finder, choose Finder > Preferences, then click Advanced. Empty Bin Automatically selects “Remove items from the Bin after 30 days”.

Other ways that macOS automatically helps to save space

How To Free Up Space On Mac For Big Sur

With macOS Sierra or later, your Mac automatically takes these additional steps to save storage space:

Free Up Space On Macbook Pro

• Detects duplicate downloads in Safari, keeping only the most recent version of the download
• Reminds you to delete used app installers
• Removes old fonts, languages and dictionaries that aren't being used
• Clears caches, logs and other unnecessary data when storage space is needed

Free Up Storage On Mac

How to free up storage space manually

Even without using the Optimised Storage features of Sierra or later, you can take other steps to make more storage space available:

Storage Apps For Mac Os

• Music, films and other media can use a lot of storage space. Learn how to delete music, films and TV programmes from your device.
• Delete other files that you no longer need by moving them to the Bin, then emptying the Bin. The Downloads folder is good place to look for files that you may no longer need.
• Move files to an external storage device.
• Compress files.
• Delete unneeded email: In the Mail app, choose Mailbox > Erase Junk Mail. If you no longer need the email in your Deleted Items mailbox, choose Mailbox > Erase Deleted Items.

Learn more

Storage Apps For Android

• The Storage pane of About This Mac is the best way to determine the amount of storage space available on your Mac. Disk Utility and other apps may show storage categories, such as Not Mounted, VM, Recovery, Other Volumes, Free or Purgeable. Don't rely on these categories to understand how to free up storage space or how much storage space is available for your data.
• When you duplicate a file on an APFS-formatted volume, that file doesn't use additional storage space on the volume. Deleting a duplicate file only frees up the space required by any data that you might have added to the duplicate. If you no longer need any copies of the file, you can recover all of the storage space by deleting both the duplicate and the original file.
• If you're using a pro app and Optimise Mac Storage, learn how to make sure that your projects are always on your Mac and able to access their files.