iPhone backups on your Mac go to one hidden folder, not scattered across your computer

When you plug an iPhone into a Mac and back it up through iTunes or Finder, the entire backup file lands in a single location: ~/Library/process Support/MobileSync/Backup/. That tilde (~) means your home folder. The backup is one folder with a long string of letters and numbers as its name, containing everything from your phone — photos, messages, app data, contacts, settings.

The reason this matters: if your Mac's hard drive fails, you need to know where that backup lives to recover it. If you're trying to free up space, you need to know what you can safely delete. If you're selling your Mac, you need to know what to wipe. Most people never see this folder because it's hidden by default — your Mac doesn't show it in Finder unless you tell it to.

Key Takeaways

  • iPhone backups on Mac are stored in a hidden folder at ~/Library/process Support/MobileSync/Backup/, not in iCloud or scattered across your computer.
  • Each backup is a single folder with a random name; if you have multiple backups, each one takes up several gigabytes of space.
  • You can see this folder by enabling hidden files in Finder, or by navigating directly using the Go menu.
  • Deleting old backups from this folder frees up hard drive space, but you lose the ability to restore from that backup.

How to find the backup folder on your Mac

The folder is hidden because Apple assumes most people don't need to touch it. To see it, open Finder and click the Go menu at the top. Select "Go to Folder" and type ~/Library/process Support/MobileSync/Backup/ exactly as written, then press Enter. Finder will jump straight to the folder.

Inside, you'll see one or more folders with names like "1a2b3c4d5e6f7g8h9i0j1k2l3m4n5o6p". Each folder is a complete backup of an iPhone or iPad. The size varies — a backup with years of photos and messages can be 50 gigabytes or more. If you've backed up multiple devices or the same device many times, you'll see multiple folders here.

The difference between local backups and iCloud backups

A backup stored in this Mac folder is a local backup — it lives only on your computer's hard drive. It does not sync to iCloud. This is the backup that happens when you plug your phone into your Mac and iTunes or Finder shows "Back up now."

iCloud backups are separate and stored on Apple's servers, not on your Mac. You can see whether your iPhone is set to back up to iCloud by going to Settings > [Your Name] > iCloud > Photos or Settings > [Your Name] > iCloud > Backup. If iCloud Backup is on, your phone backs up automatically over Wi-Fi. That backup does not appear in the MobileSync folder on your Mac — it's on Apple's servers, and you can't see it in Finder.

Many people use both: a local backup on their Mac for speed and control, and an iCloud backup for safety if the Mac fails. They serve different purposes.

How much space backups take up and when to delete them

A single iPhone backup typically uses 5 to 50 gigabytes, depending on how many photos, videos, and apps are on the phone. If your Mac's hard drive is nearly full, deleting old backups is one of the fastest ways to reclaim space. To delete a backup, open the MobileSync/Backup folder, right-click the backup folder you want to remove, and select Move to Trash.

Before you delete, know what you're losing: once that backup is gone, you can no longer restore your iPhone to that point in time. If you delete a backup from three months ago and later realize you need to recover a photo from then, that backup is gone. Keep at least your most recent backup, and consider keeping one older backup as a safety net.

If you back up your iPhone regularly, old backups pile up. Your Mac doesn't automatically delete them — it's your job to clean them out. Some people keep only the most recent backup; others keep one from each month.

Why you might not see the backup folder

If you navigate to ~/Library and the process Support folder isn't there, your Mac may have hidden it. This happens on some systems. The simplest fix is to use the Go to Folder method described above — type the full path and Finder will take you there even if you can't see the parent folders.

Alternatively, you can tell Finder to show all hidden files. Open Terminal (in Applications > Utilities) and type defaults write com.apple.finder AppleShowAllFiles TRUE, then press Enter. Quit and reopen Finder. Now hidden folders will appear. To hide them again later, type the same command but replace TRUE with FALSE.

What happens to backups when you upgrade macOS or buy a new Mac

If you upgrade macOS on the same Mac, the MobileSync folder stays in place and your backups remain. You can still restore from them. If you buy a new Mac, the backups stay on the old Mac — they don't transfer automatically. You can copy the entire MobileSync/Backup folder to an external drive, then copy it to the same location on your new Mac, and your backups will be there.

When you sell or give away a Mac, delete the MobileSync folder before handing it over. Even if you erase the hard drive, a determined person with the right tools might recover deleted files. Removing the backup folder removes the risk that someone else could restore your iPhone data on their own device.

Frequently Asked Questions

Can I move my iPhone backups to an external drive to save space?

Yes. Copy the entire MobileSync/Backup folder to an external drive. Then delete it from your Mac. When you plug your iPhone in later, iTunes or Finder will create a new backup folder on your Mac. If you ever need an old backup, copy the folder back from the external drive to the same location.

How do I know which backup is which if I have multiple devices?

The folder names are random strings, so they don't tell you which device they belong to. Right-click a backup folder, select Get Info, and look at the date modified — that tells you when it was last updated. If you back up multiple devices on the same Mac, the most recent backup is usually the one you used last. You can also connect each device and check which backup is newest.

What if I delete a backup by accident?

If you emptied the Trash when ready after deleting, the backup is gone. If the Trash still has it, open Trash, find the backup folder, right-click it, and select Put Back. It will return to the MobileSync/Backup folder. If the Trash was emptied, the backup cannot be recovered.

Does Time Machine back up my iPhone backups?

Yes. If you use Time Machine to back up your Mac, the MobileSync folder is included. This means you have a backup of your backup — if you accidentally delete a backup folder, you can restore it from Time Machine. This is one reason to keep Time Machine turned on.

Can I restore an iPhone backup from a Mac to an iPad?

No. iPhone backups and iPad backups are separate, even though they're stored in the same folder. Restoring an iPhone backup to an iPad will fail. Each device needs its own backup.