By Dylan / Last update December 17, 2020

iPhone Backup Not Enough Space on Computer

When I was backing up my iPhone X with iTunes, it says not enough space on my PC but actually there was at least 500GB free space so I don’t think it’s not enough. I don’t know where my backup is saved. Any help would be appreciated.

- Question from Apple Community

Your iPhone data need to be protected so regularly backing up iPhone is very necessary. It would be very helpful for retrieving lost data or transferring data from old iPhone to new iPhone.

Backing up iPhone is not so easy as backing up an Android phone. Although you could create an iPhone backup with iTunes by one click, the whole process is not just that. You cannot control saving which data to iTunes backup or transferring back what from iPhone backup.

iTunes No Enough Storage

If you can’t backup iPhone to iTunes for not enough space, you can follow this guide to know why it happens and how to fix the issue.

How much space does iPhone backup take and where is it stored?

Before you backup iPhone with iTunes, you need to know what iTunes backup includes. Your app data and iPhone settings will be saved to computer, but the data stored in the server will not be saved, so how much space does iPhone backup take on computer?

Usually, a full iPhone backup is larger than 7GB. iCloud backup saves nearly the same things like iTunes, so you can check iCloud backup size to estimate the iTunes backup size. Go to iPhone Settings > [your name] > iCloud > Manage Storage > tap your iPhone name and you would see the estimated iCloud backup size.

Your iTunes backup would be stored in C Drive by default, so you have to leave at least 10GB of free space in C Drive.

iTunes Logo

How to fix iPhone backup not enough space on computer bug?

After checking iPhone backup size, you are sure there is enough storage place in C drive, but iTunes still reports not enough space error, so this could be a system bug, you can easily fix it.

Solution 1. Restarting PC

More than 90% of system glitches could be solved by rebooting. You could restart your computer and try backing up iPhone with iTunes again.

Solution 2. Update or Reinstall iTunes

The version of iTunes might be too old, so you need to update it to the latest version. Reinstalling iTunes would be much helpful.

iTunes Check For Updates

How to backup iPhone to another partition or external drive?

If you find that there is not enough space to backup iPhone on pc, you can change the backup location to another partition on computer or backup iPhone to external drive on Windows.

Solution 1. Delete old backups

You could delete your backup in iTunes settings or Windows Explorer. Just go to iTunes > Edit > Preferences > Devices to delete your old backup. In Windows File Explorer, you could find your backup in C:\Users\[PC name]\AppData\Roaming\Apple Computer\ MobileSync.

Solution 2. Change iTunes backup location

You could find no options in iTunes settings to change the destination to save iTunes backup while iTunes must obey the rule of Windows so you could use CMD to change it. “mklink /J” could help you connect the folder from another drive.

Step 1. Go to C:\Users\[PC name]\AppData\Roaming\Apple Computer\ MobileSync. Cut the whole folder of MobileSync to your wanted destination.

Step 2. Press Windows + R and input “cmd” in the box.

Step 3. Enter mklink /J “C:\Users\[PC name]\AppData\Roaming\Apple Computer\MobileSync\Backup” “D:\MobileSync” (the second path is optional for you)and press Enter. If it asks for Administration Rights, in step 2, you should type “cmd” in Search bar, right-click it and select Run as administrator.

If you could not find the folder AppData, it is hidden by system. You need to click View at the toolbar in Windows Explorer and check Hidden items.

change iTunes backup location

Solution 3. Backup iPhone with AOMEI MBackupper

If you think it is too complicated to change iTunes backup location, you could try a more convenient iPhone backup software. AOMEI MBackupper is a free professional iPhone backup software. You could preview and select photos, videos, music, contacts, and messages to computer. It supports most iPhone models from iPhone 4 to iPhone 12 and would be perfectly compatible with the latest iOS 14.

Step 1. Download AOMEI MBackupper for free. Connect your iPhone to computer and tap “Trust” on it.

Step 2. Click Custom Backup. You could click an icon to preview and select what you want. Click OK to return.

Select Files

Step 3. You could click the path in the lower-left corner to store your iPhone backup anywhere on computer or even backup iPhone to external drive. Click Start Backup and your backup would be completed.

Click Start Backup


When iTunes says iPhone backup not enough space on computer, you can follow this passage to fix the system glitched or change iTunes backup location.

AOMEI MBackupper is a decent iTunes alternative because it lets you know and control everything about your backup.

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