1. Open iTunes, making sure that you have the latest version. If you do not have iTunes installed on your computer, you can download it here.

2. Connect your device to your computer using a USB cable. Select your iPhone, iPad, or iPod touch when it appears in the upper-left corner of the iTunes window. 

3. On the Device Summary screen, navigate to the Backups section, and select 'Encrypt [device] backup', then click 'Back Up Now' - please note that clicking this button will overwrite and encrypt any of your previous device backups.

4. You will be asked to create a password for your backup file. Make sure that you choose a password that you can remember, or write it down and store it safely. Without this password, you won't be able to use your iTunes backups in the future.

Once you have set your password and confirmed it, iTunes will start the process of creating an encrypted backup of your device. 


If you need to check if your iTunes backup file is encrypted, you can navigate to the Preferences tab - this is found in 'iTunes>Preferences' in Mac, and 'Edit>Preferences' in Windows. Once the Preferences window is open, click on the Devices tab, where you will see a list of backup files on your computer. If iTunes has successfully created an encrypted backup of your device, there will be a padlock symbol displayed next to your device's name.

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