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Before You Install iOS 27, Make Sure You Have the Right iPhone Backup

2026-09-15 | original
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Why This Matters

This story is a practical reminder that, while iCloud automatically backs up iPhones, that backup can't be used to roll back to an older iOS version if something goes wrong after updating. It matters because millions of users updating to iOS 27 could lose the ability to restore their data if the update causes issues, unless they create a separate local archive first.

Key Takeaways
Worth a Look

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Back up your iPhone before installing the latest version of iOS. Jeff Carlson/CNET

Shortly before the iPhone 18 Pro is due to arrive (and anticipating the iPhone Duo in October), Apple has released iOS 27 for models all the way back to the iPhone 11. But before you tap that update button, believe me that you want a backup of your data in place.

I’m not talking about any regular backup, though. Hopefully, you already have your Apple Account settings configured to automatically back up the phone to iCloud, which is invaluable for everyday peace of mind. I’m talking about creating an archive that can save your hide in the unlikely event something goes wrong with the iOS 27 update.

Why an archive is essential before installing a new version of iOS

You’re probably accustomed to using iCloud Backup to maintain a regular fallback for your data. It works in the background (when you’re asleep and charging your device) and involves the least amount of backup friction, as long as you have sufficient iCloud storage space available. Go to Settings > iCloud > iCloud Backup and turn on Back Up This iPhone if it’s not already active.

However, when it comes to moving to a full release version of iOS, such as from iOS 26 to iOS 27, an iCloud Backup introduces a problem: You cannot restore from that cloud backup if you revert back to the previous OS version. And unfortunately, iCloud keeps just the most recent backup — you can’t pick and choose from previous backup iterations. If you try to use an iOS 27 cloud backup to restore back to iOS 26, you’ll get an error. (Making an archive is also an important step when you install iOS betas.)

This is why you need to archive a backup on your computer.

iOS warns you if you try to restore from an iCloud backup made under a newer version of iOS. Jeff Carlson/CNET

Should you encrypt the local backup?

Before you create this archived backup, you should decide if you want to enable one of the options, Encrypt local backup. For security, this feature scrambles the data to prevent someone with access to your computer from accessing it. This option also preserves sensitive information in the backup such as saved passwords and personal data in the Health and Fitness apps.

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Explore topics: ios 27 iphone backup icloud backup iphone 18 pro apple account
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