
Regularly creating iCloud or iTunes backups should be routine for every iOS user, but if you want to upgrade to a beta version of iOS or if you think you might want to downgrade shortly after installing a new iOS update, you'll want to make sure create an archived iTunes backup beforehand.
An archived iTunes backup is essential because it saves the current state of your iOS device and prevents it from being accidentally overwritten by subsequent backups. Apple recommends all public beta testers create an archived backup before installing a beta in case something goes wrong and a restore is needed. Here's how to do it.
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Article Link: How to Create an Archived iTunes Backup