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Hupixdel's avatar
Hupixdel
Silver Contributor
Apr 23, 2026

Mac system data too large. How to clear system data on mac

Hi all, Ran into an issue with a Mac where System Data is taking up a huge chunk of storage (over 100GB), and it keeps growing.  But it doesn't really show what is inside that category, so it's hard...
BreckenFoster's avatar
BreckenFoster
Steel Contributor
Apr 23, 2026

If you’re wondering how to clear system data on mac, start with simple native methods that require no third-party software. These built-in tools are safe, reliable, and perfect for beginners who want to free up space quickly without extra downloads.

how to clear system data on mac

Step 1: Restart your Mac

  • Simply restarting your Mac clears temporary system data, which is an essential first step in clearing system data on a Mac.
  • Check your local Time Machine snapshots

1.Open Terminal from Applications → Utilities.

2.Run this command:

tmutil listlocalsnapshots /

3.If snapshots appear, execute:

sudo tmutil deletelocalsnapshots /

This step can free up 20-50GB of storage.

Step 2: Erase the iOS backup

  • Click the Apple menu → System Settings → General → Storage.
  • Scroll to find "iOS Files", then tap the ⓘ icon.
  • Delete outdated iPhone and iPad backups, keep only the latest copy.Each old backup may take up 10-30GB of disk space.

These built-in cleanup steps are a great place to start—they’ll free up a significant amount of storage space on your Mac without requiring any additional software. By performing these simple tasks regularly, you can effectively manage system data, avoid unnecessary clutter, and ensure your Mac stays fast and responsive for years to come.