
Since some of the files mentioned above are not necessary, you can delete them to lessen their impact on your storage. The size of System Data varies depending on the state of your Mac. System Data contains files that do not fall into categories such as Documents, Apps, iCloud Drive, Photos, Other Users, etc.

So what exactly is it? What Is System Data on Mac?

In this case, the System Data is 136.63 GB and is taking up the largest part of my storage space. Hover your cursor over each category, you can know its name and size.Hover over a color to see its category and the amount of space it uses.You'll see a colored bar, with each color representing a category.(On macOS Monterey, choose Apple menu > About This Mac > Storage.) Choose Apple menu > System Settings > General > Storage.When it’s done, you’ll have High Sierra on your Mac.Also Read: How to Free Up Space on Mac How to Check System Data Storage on Macīefore understanding what System Data storage is, let's check how much space it is using on your Mac. Your Mac will restart and proceed with the installation.If you have other applications open, the installer will ask to close those apps.The installer will tell you it needs to restart the Mac to proceed.Enter this information and click Add Helper. You must enter the username and password for the new “helper tool” that the installer wants to install.Select your Mac’s startup drive and click Install.Read the software license agreement and click Agree.It will be saved to your Applications folder. You can quit (Command-Q) if you want to run the installer later. When the download finishes, the installer will automatically launch.When you’re ready, click the Download button at the upper left.

