How to Stop iPhone Backups From Filling Up Your Mac's Storage (2026)

If you have ever glanced at your Mac's storage and wondered where dozens of gigabytes vanished overnight, iPhone and iPad backups are a very likely culprit. Learning how to stop iPhone backups filling up your Mac can recover a substantial chunk of your disk — often 20 GB to 100 GB or more — without losing anything you actually need. This guide walks through where these backups live, how large they grow, how to manage or redirect them, and what you can safely delete today on macOS Sequoia and Tahoe running on Apple Silicon or Intel.

Where Does macOS Store iPhone Backups?

Local iTunes and Finder backups land in a single folder that most users never see:

Each device backup is stored as a hashed subfolder with a name like a1b2c3d4e5f6.... There is no human-readable label, which is why the storage can balloon silently. To open the folder quickly, paste the path into Finder's Go > Go to Folder dialog (Shift ⌘ G).

On macOS Sequoia and Tahoe the path is unchanged from earlier releases; what has changed is that the system storage graph now sometimes groups these backups under iOS Files rather than Documents, which can make them harder to spot in System Settings > General > Storage.

How Large Do iPhone Backups Actually Get?

Backup size depends on how much data your phone contains and how many old backups accumulate. The table below shows typical sizes for common scenarios so you can set expectations before you start cleaning.

How to Find and Delete Old iPhone Backups in Finder (Step-by-Step)

This is the safest and most direct method. Finder shows you each backup with its device name and date before you delete anything.

1. Connect your iPhone or open Finder (the backup manager does not require a connected device).
2. In the Finder menu bar click Finder > Settings (macOS Ventura and later) or Preferences, then confirm Show connected servers and devices is on — this has no effect on the backup list, but verifies Finder is managing devices.
3. Open a new Finder window and press Shift ⌘ G. Paste: ~/Library/Application Support/MobileSync/Backup
4. Sort by Date Modified. Folders older than your current device or labelled with UDIDs you do not recognise are candidates for deletion.
5. To confirm which device a folder belongs to: open Finder, click your connected iPhone in the sidebar, scroll to the bottom of the General tab, and click Manage Backups. A sheet lists every local backup with device name, iOS version, and size.
6. Right-click any backup in the Manage Backups sheet and choose Delete Backup. Finder confirms before removing the folder.
7. For backups from devices you no longer own, you can delete the hashed subfolders directly in Finder. Drag to Trash, then empty.

If you are not sure a backup belongs to an active device, keep it until you have verified the phone is either restored or backed up to iCloud — then delete.

How to Stop New Local Backups From Being Created

Deleting old backups solves the past; the steps below stop the folder from growing again.

Switch to iCloud Backup

iCloud Backup is the cleanest long-term fix. When iCloud Backup is on, plugging the iPhone into the Mac no longer triggers a local backup automatically.

1. On your iPhone open Settings > [your name] > iCloud > iCloud Backup.
2. Toggle Back Up This iPhone on.
3. Back on the Mac, open Finder, click your iPhone, and under the General tab select Back up all of the data on your iPhone to iCloud.

iCloud Backup requires sufficient iCloud storage (5 GB free tier is rarely enough for a full phone; the 50 GB or 200 GB plan covers most users).

Disable Automatic Local Backups Without iCloud

If you prefer local backups but want to control when they happen, hold down Option while clicking Back Up Now in Finder — this has no effect in itself, but removing automatic backup can be achieved by keeping Automatically sync when this iPhone is connected unchecked in the General tab. Backups then only run when you manually click Back Up Now.

Move the Backup Folder to an External Drive

If you want local backups but your internal SSD is cramped, you can redirect the MobileSync folder to an external drive using a symbolic link. This keeps backups off your internal storage entirely.

1. Quit Finder's device management (disconnect your iPhone) and close any syncing apps.
2. Move the existing backup folder to your external drive. For example, if your drive is mounted at /Volumes/Backup:

mv ~/Library/Application\ Support/MobileSync/Backup /Volumes/Backup/MobileSyncBackup

3. Create a symbolic link in the original location pointing to the new path:

ln -s /Volumes/Backup/MobileSyncBackup ~/Library/Application\ Support/MobileSync/Backup

4. Verify the link exists: ls -la ~/Library/Application\ Support/MobileSync/ — you should see Backup -> /Volumes/Backup/MobileSyncBackup.
5. Reconnect your iPhone and run a test backup from Finder. Confirm the data lands on the external drive.

Important: the external drive must be connected whenever you plug in your iPhone, otherwise Finder may error or write nothing. This approach works best with a desktop Mac or an always-connected NAS.

Check What Else Is Hiding in MobileSync

The MobileSync folder sometimes holds more than just the Backup subfolder. Check for:

• ~/Library/Application Support/MobileSync/Backup/ — the main backup data
• Residual device crash logs under ~/Library/Logs/CrashReporter/MobileDevice/ — usually small but worth reviewing
• iPhone software (IPSW) files cached under ~/Library/iTunes/iPhone Software Updates/ — each IPSW can be 5 – 8 GB

IPSW files are safe to delete once your phone is updated; macOS re-downloads them if needed for a restore. To find and understand what is taking up space on your Mac across all these folders, a tool like Crumb can audit all of them at once and show what is safe to remove before you delete anything.

iCloud Backup vs. Local Backup: Which Is Right for You?

Both approaches protect your data; the choice comes down to convenience, cost, and security preference.

• iCloud Backup — automatic, offsite, zero Mac disk usage. Requires a paid iCloud plan for most users. Restores are slower over a network connection.
• Local Finder Backup — free to use, can be encrypted end-to-end, restores in minutes. Consumes 10 – 100+ GB on your Mac. Requires you to manage old backups manually.
• Both simultaneously — possible but uncommon; selecting iCloud in Finder disables automatic local backups, as described above.

For most Mac laptop users where internal SSD space is finite, iCloud Backup combined with periodic manual local backups before major iOS updates is a practical middle ground. For users with large external drives and privacy concerns about cloud storage, local backups redirected via symlink are a solid alternative.

Keeping Storage Under Control Long-Term

iPhone backups are one layer of hidden storage growth. Developer caches, log archives, and old application containers are others. The free-up-space guide at how to free up space on Mac covers the full picture across all major categories. As a quick checklist for backup hygiene specifically:

• Review Manage Backups in Finder every 3 – 6 months and delete backups from devices you no longer own.
• After upgrading to a new iPhone, keep the last backup from the old device for 30 days, then delete it once you are confident the migration succeeded.
• Check ~/Library/iTunes/iPhone Software Updates/ and delete any IPSW files for iOS versions you are no longer running.
• If using iCloud Backup, periodically verify the backup succeeded in Settings > [your name] > iCloud > iCloud Backup — a failed backup is worse than no backup.
• Consider an encrypted local backup before any major macOS or iOS upgrade as an extra safety net, then delete it a month later.