The Silent Data Deletion
The macOS Trash bin is designed to act as a fail-safe. When you drag a file to the Trash, you expect it to remain there safely, allowing you to easily recover it if you realize later that you made a mistake. However, Apple includes a storage optimization feature that automatically and permanently deletes any file that has been sitting in the Trash for more than 30 days. If you use the Trash bin as a long-term holding area for “maybe I’ll need this later” files, this silent, background deletion can result in catastrophic data loss.
How to Disable the 30-Day Auto-Empty Rule
You can instruct the Finder to completely ignore the 30-day rule, ensuring that files remain in the Trash bin permanently until you manually decide to empty it.
1. Click on the Finder icon (the smiling blue face) in your Dock to make it the active application.
2. Click the word Finder in the top-left corner of the menu bar.
3. Select Settings from the drop-down menu (or Preferences on older macOS versions).
4. In the new window that appears, click the Advanced tab at the very top (the gear icon).
5. Look down the list of options for the checkbox labelled Remove items from the Trash after 30 days.
6. Untick this checkbox.
7. You can now close the Finder Settings window.
Managing Your Storage Manually
By turning off this feature, your Mac will no longer delete anything on its own. While this protects your files, it also means your Trash bin will continuously grow in size, slowly consuming all the available free space on your hard drive. To keep your Mac running smoothly, you must now remember to periodically check your Trash bin, review the files inside, and manually right-click the Trash icon in the dock to select Empty Trash when you are absolutely certain you no longer need the data.