Time Machine safety guide
Understand Time Machine local snapshots before removing them
Time Machine can keep local APFS snapshots when the backup disk is unavailable. They may appear within System Data, but macOS counts snapshot space as available and normally removes snapshots as space is needed. A snapshot is a recovery point, not an ordinary file, and deleting it cannot be undone or moved to Trash.
What macOS can do on its own
Most Macs should let macOS manage local snapshots. Investigate only when there is a measured storage problem and another current backup exists.
- Connect the Time Machine backup disk and allow a current backup to finish.
- Confirm that the external backup is readable before changing local recovery points.
- Use Disk Utility or the read-only `tmutil listlocalsnapshots /` command to understand whether local snapshots exist.
- Wait and recheck available capacity; macOS normally thins snapshots automatically when their space is needed.
When Mint helps
Mint Direct can present local snapshots as a distinct, high-risk category instead of mixing them with ordinary cleanup files.
- List snapshot count and age without pretending shared APFS blocks have a precise file size.
- Check whether a Time Machine destination and recent external backup are available.
- Require explicit review before asking macOS to thin older snapshots.
- Keep this capability out of the App Store edition, whose sandbox does not perform snapshot mutation.
Boundaries and safety checks
Snapshot thinning has a different recovery model from every Trash-based Mint cleanup category.
- APFS snapshots cannot be moved to Trash, so deletion is permanent and Mint Undo does not apply.
- Do not remove the only recent recovery point when an external backup is missing or stale.
- Reported snapshot size is not a simple sum because APFS shares blocks and macOS already treats much of the space as available.
Frequently asked questions
Do local snapshots always waste disk space?
No. Apple says their space is counted as available and macOS deletes snapshots as space is needed. They also provide a useful recovery window between external backups.
Can snapshots be restored from Trash?
No. They are APFS metadata rather than ordinary files; deletion is irreversible.
Can the App Store edition of Mint delete snapshots?
No. Snapshot thinning is not available in the sandboxed App Store edition. Mint Direct treats it as a separate, explicit, permanent action.
Separate snapshots from ordinary cleanup files
Use Mint Direct to review snapshot context and supported file-backed findings before choosing any permanent action.