The Optimised Storage features of your Mac help you save storage space by storing your content in iCloud and making it available on demand:

1. How To Free Up Space On Your Mac Hard
2. How To Free Up Space On Your Mac Hard Drive
3. How To Free Up Space On Your Mac Laptop

Whenever we delete something from Mac, it is moved to Trash. This lets us recover the files that we have deleted accidentally. Though, if you wish to clear space on Mac, then it is important to wipe the Trash folder as well. In this way, you can delete files from Trash permanently and clear disk space on Mac easily. 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. Free Up Space on MacBook Air or MacBook Pro ( 12 Easy Ways) 1. Delete Large Files on your Mac. Instead of deleting a hundred small files and images, first of all, let us go for the big fish. Click on the Apple logo from the upper left and select About This Mac. Now, click on Storage and then click on Manage. Click Documents.

• 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 be downloaded 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, find out about other ways to free up storage space.

Find out how much storage is available on your Mac

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.

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.

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've opened recently will be kept on your Mac, so you can work offline easily. Files stored only in iCloud display 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. Find out 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 US$0.99 a month, and you can purchase additional storage directly from your Apple device. Find out more about the prices in your region.

Optimise Storage

Click the Optimise button to save space by automatically removing films and TV programmes you've watched. When storage space is needed, films or TV programmes that you've purchased from Apple 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.

Your Mac will also save space by only keeping recent email attachments on this Mac when storage space is needed. You can manually download any attachments at any time by opening the email or attachment, or saving 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 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.

Find out 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 or later, choose Apple menu  > System Preferences, click Apple ID and then select iCloud in the sidebar: store in iCloud will turn on the Optimise Mac Storage setting on the right. To turn off iCloud Drive entirely, deselect iCloud Drive.
• If you're using macOS Mojave or earlier, choose Apple menu > System Preferences, click iCloud, 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 or later, open the Apple TV app, choose TV > Preferences from the menu bar, then click Files. Optimise Storage selects “Automatically delete watched films and TV programmes”.
• If you're using macOS Mojave or earlier, open iTunes, choose iTunes > Preferences from the menu bar, 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

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

• 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

How to free up storage space manually

Even without using the Optimised Storage features described in this article, you can take other steps to make more storage space available:

• 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

• 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 display storage categories, such as Not Mounted, VM, Recovery, Other Volumes, Other, 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 won'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, find out how to make sure your projects are always on your Mac and that you're able to access their files.

If you have tried to upgrade to macOS Big Sur, particularly on a Mac with a 128GB SSD, you may have encountered an error message telling you that you don’t have enough free space for the installation. But how much space does macOS take? Let’s find out.

How much space does macOS Big Sur need?

If you’ve downloaded Big Sur, or looked closely at its page on the App Store, you’ll know that the installer/download size is 12.6GB. And you might think that’s all the space you need. But know, that disk image is just the start. It’s not the same as the macOS size on disk. Take a look at the system requirements on Apple’s website, and you will see that you need 35.5GB of free space, and that’s if you’re upgrading from macOS Sierra or later. If you’re trying to upgrade from an earlier version of macOS, you’ll need a whopping 44.5GB of space.

How much space does macOS Catalina need?

If you think that the 35.5GB Big Sur insists on is a huge jump from previous versions of macOS, you’d be right. Catalina, for example, only needs 12.5GB if you’re upgrading from Sierra or later, or 18.5GB if you’re upgrading from an earlier version of macOS. Why is Big Sur so hungry for disk space? Apple doesn’t say. Perhaps it’s for all the new Memoji headgear, hairstyles, and face coverings. Most of the space though is for system files.

What are macOS system files?

How To Free Up Space On Your Mac Hard

Simply, they are all the files macOS installs and that are needed to boot and run your Mac. They include log files, resources, instructions, and everything else the operating system needs.

How to free up space to install macOS

The only way to create enough space on your Mac to upgrade macOS is to get rid of files on your Mac. But how do you choose what to remove and what to keep? Apple’s Manage Storage tool can help.

How To Free Up Space On Your Mac Hard Drive

1. Click on the Apple menu and choose About this Mac.
2. Select the storage tab.
3. Press Manage and follow the instructions.

Find large hidden files with an app

Some Mac cleaning apps, apart from their main purpose, are actually a good way to find unused stuff on your Mac. You can use a tool like CleanMyMac X to find your large hidden files, and then delete them manually. Anyway, using such a tool will save you lots of time.

CleanMyMac X has an instrument that identifies large and old files, allowing you to quickly identify the files that will free up most space, or cause the least disruption if you remove them.

You can filter the results by media type and date.

How To Free Up Space On Your Mac Laptop

Download the free version of CleanMyMac X here (this tool is notarized by Apple).

Run the app and select Large & Old files from the sidebar.

Also, check the Space Lens tool. This is another way to find the unused space.

How to upgrade your macOS

Once you’ve freed up enough space, you can go ahead and upgrade.

1. Click on the App Store icon in the Dock.
2. When it launches, search for the version of macOS you want to upgrade to, e.g. Big Sur.
3. Press Download and follow the instructions.

macOS upgrades seem to take up more and more space with each version, and this can be a problem if you don’t have enough free space on your boot disk. However, there are lots of options for freeing up space, so you can go ahead and upgrade.