You usually have to erase first
iOS does not let you restore a backup onto a phone that is already set up. The restore option appears during the initial setup flow, which means restoring an in-use iPhone requires erasing it first: Settings → General → Transfer or Reset iPhone → Erase All Content and Settings.
Before you do that, confirm the backup you intend to restore actually exists and is recent. Erasing a phone and then discovering the backup is three months old is a bad sequence to be in.
Backups only restore forward
A backup made on a newer version of iOS cannot be restored onto an older one. iOS refuses, and the refusal comes at the end of the process — after the device has already been erased.
This is the single most important rule here. It is why a backup made before an update is the only route back after one, and why an iCloud backup taken while running a beta is not an escape route. Our pre-update backup guide covers the sequence properly.
Restoring from iCloud
During setup, choose Restore from iCloud Backup, sign in and pick the backup by date. Settings, app layout and messages come back first; apps and photos continue downloading in the background for anywhere from an hour to a day depending on your library and connection.
Stay on Wi-Fi and on power while that finishes. Apps show as greyed-out placeholders until they arrive, which is normal rather than a failure.
Restoring from a computer
Connect the iPhone during setup and choose Restore from Mac or PC. Select the device in Finder or the Apple Devices app, choose Restore Backup and pick the one you want by date.
This is faster than iCloud because nothing is downloaded. If the backup was encrypted you will need its password — without it the backup cannot be opened, and Apple cannot recover it.
What comes back and what does not
Settings, app data, Home screen layout, messages and Health data (encrypted backups only) all return. Apps are re-downloaded from the App Store rather than restored from the backup, so an app that has since been withdrawn cannot come back, and its data is lost with it.
Face ID and Touch ID enrolments are not restored and must be set up again, and some banking and authentication apps deliberately require fresh setup. Our guide to backup contents covers the detail.
If the restore fails part-way
An interrupted restore usually leaves the iPhone in setup rather than broken; connecting to power and Wi-Fi and letting it resume resolves most cases. If it will not proceed, erasing and starting the restore again is safe — the backup itself is not consumed by a failed attempt.
If the phone will not boot far enough to reach setup at all, recovery mode is the route. Our IPSW guide covers restoring the operating system itself, which is a different operation from restoring your data.
Frequently Asked Questions
Can I restore a backup without erasing my iPhone?
No. iOS offers the restore option only during setup, so an in-use iPhone must be erased first.
Can I restore a newer backup onto an older iOS version?
No. Backups only restore forward, and the refusal comes after the device has already been erased.
How long does restoring from iCloud take?
The core restore takes under an hour; apps and photos continue downloading in the background for several hours to a day.
What if I lost my encrypted backup password?
The backup cannot be opened. Apple cannot recover it — this is how the encryption works, not a support policy.