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I was checking my directory and found out that the Folder Backup in Library > Application Support > Mobile Sync > Backup, is taking 13GB of my Harddisk ... What is this and why is taking so much space .. Can I delete it ?

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up vote 27 down vote accepted

It's the folder where iTunes saves the backUps of your iDevice. And it takes so much space because each time you sync a device, previous backUps are not deleted.

Deleting the folder will, then, mean losing those backUps. Doing this regularly is advised for saving HD space. Just make sure to make a new backUp afterwards, and that you won't need those backUps.

You can do that through iTunes too, by:

  1. Opening iTunes / Preferences / Devices.
  2. A list with all the Devices will be show. Select the one's backUps you want to delete and click Delete Backup.

Note that all of the backUps of that iDevice will be deleted.

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I assume that you are referring to ~/Library/Application Support/Mobile Sync/Backup. This is the location where backups of iOS devices created by iTunes reside. Each sub-folder represents a different iOS device. If you delete this folder you will be unable to restore your iOS devices to their backed up state from iTunes. if you wish to see a list of backups stored by iTunes, open iTunes, go to the iTunes menu > preferences. Find the Devices tab in preferences and select it and you should see a list of device backups.

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