If you connect your iOS device to your computer to back up your data instead of using iCloud, some of your most private data is not backing up. For security reasons, by default, an iTunes backup will not include saved passwords, Wi-Fi settings, website history, or Health data.
You can save information like passwords and website history in an iTunes backup if you encrypt it, which is an option that Apple offers. Encrypted backups are not the default option, but for those of you who want to be able to save more comprehensive backups to your computer, we've created a tutorial that walks you through encrypting iTunes backups and removing that encryption.
If you back up your iOS device using iCloud, you do not have to follow any steps for encryption, as iCloud backups are automatically encrypted for you.
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Article Link: How to Encrypt Your iOS Device's iTunes Backup