--- title: "How to clear System Data on macOS Tahoe (26)" description: "System Data unusually large on macOS 26 Tahoe? What is inside it on Tahoe, what is safe to remove, and step-by-step fixes that don’t risk your files." url: https://tidymac.space/guides/clear-system-data-macos-tahoe/ updated: 2026-10-08 --- [Home](/) [Guides](/guides/) How to clear System Data on macOS Tahoe (26) # Clear System Data on macOS Tahoe System Data unusually large on macOS 26 Tahoe? What is inside it on Tahoe, what is safe to remove, and step-by-step fixes that don’t risk your files. 7 min readUpdated October 16, 2026By the Tidy Mac team Short answer On macOS Tahoe, System Data is the same mix as on other versions: Time Machine local snapshots, iPhone and iPad backups, app caches and data, developer and AI files, plus Apple Intelligence models. Restart, thin snapshots, remove old device backups, clear caches of closed apps and clean developer files with their own tools. Leave macOS and Apple Intelligence files alone. The steps 1. Restart your Mac. 2. Thin Time Machine local snapshots with tmutil. 3. Remove old iPhone and iPad backups in Finder › Manage Backups. 4. Clear caches of closed apps in ~/Library/Caches. 5. Clean developer files and remove unused AI models. 6. Turn off Apple Intelligence features you don’t use if you want to stop new models downloading. ## What’s in System Data on Tahoe The same categories as Sequoia and macOS 27: [snapshots](/learn/time-machine-local-snapshots/), [device backups](/learn/iphone-backups-on-mac/), [app caches](/learn/mac-app-caches/), developer files and local AI models, plus macOS’s own files and [Apple Intelligence models](/learn/apple-intelligence-storage-mac/), which you can’t remove. ## Steps The steps are the same as on macOS 27; see the [full macOS 27 guide](/guides/clear-system-data-macos-27/) for each command. In short: ``` sudo tmutil thinlocalsnapshots / 999999999999 4 du -sh ~/Library/* 2>/dev/null | sort -h | tail -15 ``` ![](/img/brand/tidy-128.png) ### Let Tidy Mac do this for you See every part of your storage explained, and clear junk to the Trash with Undo. $9.99 once, 2 Macs. [Download](/download/TidyMac.dmg) [Buy for $9.99 once](/buy/) ## If System Data is over 100 GB See [System Data over 100 GB](/guides/mac-system-data-100gb/) for the five usual causes and how to tell which one it is. ## Keep reading [How to clear System Data on macOS 27 Golden Gate without breaking anything](/guides/clear-system-data-macos-27/)[System Data is over 100 GB on my Mac: what’s using it?](/guides/mac-system-data-100gb/)[What is “System Data” on a Mac, and why is it so big?](/learn/what-is-system-data-on-mac/)[The best Mac cleaners in 2026, honestly compared](/guides/best-mac-cleaner/)[Is CleanMyMac worth it?](/guides/is-cleanmymac-worth-it/)[Is CleanMyMac safe to use on a Mac?](/guides/is-cleanmymac-safe/) Share:[X](https://x.com/intent/post?text=Clear%20System%20Data%20on%20macOS%20Tahoe&url=https%3A%2F%2Ftidymac.space%2Fguides%2Fclear-system-data-macos-tahoe%2F)[Reddit](https://www.reddit.com/submit?url=https%3A%2F%2Ftidymac.space%2Fguides%2Fclear-system-data-macos-tahoe%2F&title=Clear%20System%20Data%20on%20macOS%20Tahoe)[Hacker News](https://news.ycombinator.com/submitlink?u=https%3A%2F%2Ftidymac.space%2Fguides%2Fclear-system-data-macos-tahoe%2F&t=Clear%20System%20Data%20on%20macOS%20Tahoe)[LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ftidymac.space%2Fguides%2Fclear-system-data-macos-tahoe%2F) #### On this page [What’s in System Data on Tahoe](#what-s-in-system-data-on-tahoe)[Steps](#steps)[If System Data is over 100 GB](#if-system-data-is-over-100-gb) **Tidy Mac** See this on your own Mac in under a minute. $9.99 once, 2 Macs. [Download](/download/TidyMac.dmg)