Mac cleanup
How to reduce System Data on Mac safely
System Data gets smaller when you remove specific things inside it, such as old iPhone backups, build folders or app caches. Find the biggest source first, use the controls macOS or the owning app already has, and work in small batches so you can check that everything still works.
Before you delete anything
Make sure you have a recent backup that you can open. Device backups and Time Machine local snapshots are recovery points themselves, so removing them matters more when your external backup is old.
Don’t paste Terminal commands that delete whole folders. They can’t tell a cache from a database, and nothing goes to the Trash if they get it wrong.
A safe order to work in
Start with what you recognize and leave the unfamiliar for later.
- In System Settings > General > Storage, go through the recommendations and delete large downloads you don’t need.
- Uninstall apps you no longer use, with their own uninstaller if they have one.
- Remove old device backups, Docker images and virtual machines from the app that manages them, such as Finder or Docker Desktop.
- Clear rebuildable developer files like Xcode build folders once you know no current project needs them.
- After each batch, check the apps you rely on, then empty the Trash.
What removing caches does
Caches come back on their own, so they’re a sensible place to free space. Clearing one can still sign you out of an app, remove downloads saved for offline use or slow the next launch. If the app has its own setting for clearing its cache, use that.
Leave a cache alone while its app is running, because the app may write the files straight back.
Doing it with Mint
Mint’s Disk tab checks the usual sources in one scan and lists each item with its size and the reason it was flagged. Items that need your judgment, like old downloads, start unticked, so you can remove a few and check your apps before the next batch.
In the Direct and Setapp editions, caches and logs that Mint has confirmed will rebuild are deleted after one confirmation. Your own files can go to the Trash instead, and Mint keeps 90 days of history so you can undo those moves. Undo still doesn’t replace a backup.
Removing Time Machine local snapshots is a separate, permanent step in the Direct and Setapp editions, so leave it out of a first cleanup.
Frequently asked questions
What should I clean first?
Large downloads and apps you recognize and no longer use. After that, backups and caches managed by their own apps, then developer build files you’ve checked. Leave anything you can’t identify.
Will deleting caches break my apps?
Usually not, though you may be signed out, lose offline content or wait longer the next time the app opens.
How much System Data will I get back?
No one can predict that reliably. macOS recategorizes files after a cleanup, and snapshots and purgeable space can make the Storage number move differently from the size of what you removed.
Start with a small batch
Scan with Mint, remove a few items you understand and check that everything still works.