How to Delete iOS Backups on Mac and Reclaim Gigabytes

You plugged your iPhone into your Mac to sync music or charge it, and in the background macOS quietly created a full local backup of your device. That was two years and three iPhones ago. Every one of those backups is still sitting on your hard drive right now — and you probably have no idea they exist.

iOS backups are one of the most common sources of silent, massive storage loss on Macs. A single full iPhone backup can run anywhere from 20 GB to 100 GB, depending on how many photos, apps, and files are on your device. macOS never deletes old backups automatically. They accumulate — one per device, one per restore point — until you intervene.

This guide covers exactly where iOS backups live on your Mac, how large they get, how to find and delete them manually (through Finder and via Terminal), and how TrimyMac's dedicated iOS Backups category makes the whole process one-click simple.

Where Are iPhone Backups Stored on Mac?

When you back up an iPhone or iPad to your Mac using Finder (or iTunes on older macOS versions), macOS stores the backup in a fixed, hidden directory inside your user Library folder:

The tilde (~) is shorthand for your home folder — for example, /Users/yourname. So the full absolute path on most Macs looks like this:

Inside that Backup/ folder you will find one subfolder per device, named with a long alphanumeric identifier (a UUID). Each subfolder contains the complete backup for that device, stored as thousands of small files organized in a hash-based directory structure — not something you can easily browse by hand.

The ~/Library folder is hidden from casual Finder browsing by design — Apple intentionally keeps it out of sight so users do not accidentally delete important application data. This is exactly why iOS backups tend to pile up unnoticed: they are stored somewhere most users never look.

How Big Can iOS Backups Get?

The size of an iOS backup depends almost entirely on how much content is on the device being backed up. A rough guide:

The most surprising thing for most users is the "multiple backups each" scenario. macOS does not keep just the most recent backup — it can retain older snapshots depending on how backups have been triggered over time. When you factor in two or three different iPhones across a household (or a developer testing on multiple devices), it is entirely realistic to find 150–200 GB consumed by the MobileSync folder alone.

How Many Backups Does macOS Keep?

The short answer: all of them, forever. macOS does not have an automatic cleanup policy for iOS backups. Once a backup is written to disk, it stays there until you manually delete it. There is no built-in limit on how many backups are retained per device, and there is no expiry date.

This is by design — Apple assumes you would rather have too many backups than accidentally lose one — but the practical result is that users who have plugged in their iPhones for years often find dozens of gigabytes of outdated backup data sitting untouched in the MobileSync folder.

How to Delete iPhone Backups on Mac — Manual Methods

Method 1: Delete via Finder (Recommended for Most Users)

Apple provides a built-in way to manage and delete iOS backups directly from Finder. This is the safest manual approach because it shows you each backup with its device name and size, so you know exactly what you are deleting.

1. Open Finder on your Mac.
2. In the menu bar, click Finder → Settings (or Finder → Preferences on older macOS).
3. The Settings window opens. Look at the top — if your iPhone or iPad is connected, you may also access this via the device in the sidebar. But for backup management, go to the menu bar: click Finder, then hold Option and note there is no direct path here — instead, open a Finder window, connect your device, click it in the sidebar, then click Manage Backups in the General tab.
4. Alternatively (and more reliably on any Mac whether a device is connected or not): open System Settings → General → Storage, then click the info icon next to "iOS Files" or scroll down to find the iPhone/iPad Backups section.
5. A list of backups appears, showing the device name, iOS version, size, and last backup date. Select any backup you want to remove and click Delete Backup.
6. Confirm the deletion. The backup is removed immediately.

Method 2: Delete via Terminal

If you prefer the command line — or you want to inspect the backups before deleting them — Terminal gives you direct access to the MobileSync folder. This method is also useful if you want to script periodic cleanup.

First, navigate to the backup directory and list its contents to see what is there:

Each subfolder you see corresponds to one device backup. To check the total size of the entire MobileSync/Backup folder:

To see the size of each individual backup folder (so you can decide which to delete):

To delete a specific backup by its UUID folder name:

To delete all backups at once (use with caution — this is irreversible):

The Easier Way: TrimyMac iOS Backups Category

Both methods above require you to remember to check, navigate hidden folders, and make judgment calls about UUIDs with no friendly names. TrimyMac removes all of that friction with a dedicated iOS Backups category inside its Smart Clean engine.

Here is how it works:

1. Open TrimyMac and run a Smart Clean scan from the sidebar.
2. TrimyMac automatically scans ~/Library/Application Support/MobileSync/Backup/ and resolves each UUID folder to the device's name, iOS version, size, and backup date — so you see "Nikhil's iPhone 16 Pro — 67.4 GB — last backed up March 2025" instead of a meaningless hash.
3. Select the backups you want to remove. TrimyMac never removes anything without your confirmation.
4. Click Clean Selected. Items move to the TrimyMac Safe Area before permanent deletion, giving you a recovery window if you change your mind.

The iOS Backups category is available in the free tier for scanning. Cleaning is unlocked in the free tier up to the 500 MB threshold, after which a Pro upgrade is required for full unlimited cleanup.

Should You Keep Local iOS Backups? iCloud vs Local

Before you delete everything, it is worth understanding what you are giving up. Local backups and iCloud backups are not identical products — each has real trade-offs.

Our Recommendation

For most users, iCloud Backup is sufficient as the day-to-day safety net, especially if you have a paid iCloud+ plan with enough storage. Enable iCloud Backup in Settings → [Your Name] → iCloud → iCloud Backup on your iPhone, and then feel free to delete local backups for any device that is actively backing up to iCloud.

Consider keeping a local backup if:

• You are about to do a major iOS update or restore and want a guaranteed point-in-time snapshot
• You are setting up a new device and want the fastest possible restore
• You want a backup that includes encrypted health and keychain data without relying on iCloud
• You have slow or unreliable internet and cannot trust iCloud Backup to complete

In those cases, keep the most recent local backup for your current device and delete everything else. That single action typically recovers 50–150 GB for users who have never cleaned their MobileSync folder.

How to Stop Your Mac from Making iPhone Backups Automatically

Every time you connect your iPhone to your Mac and open Finder, macOS may trigger a new backup if the "Automatically sync when this iPhone is connected" option is enabled. To disable automatic local backups:

1. Connect your iPhone to your Mac with a cable.
2. Open Finder and click your iPhone in the left sidebar under Locations.
3. In the General tab, find the Backups section.
4. Select Back up all the data on your iPhone to iCloud instead of "Back up all the data on your iPhone to this Mac." This switches future backups to iCloud and stops new local backups from being created.
5. Uncheck Automatically sync when this iPhone is connected if you also want to prevent automatic syncing on connection.
6. Click Apply.

After making this change, connecting your iPhone will no longer trigger a new local backup. Any existing backups in the MobileSync folder remain until you delete them — this setting only stops future local backups from being created.