restore backup

You can restore backups from older iOS onto devices running higher iOS versions.

"restore backup: my phone does not give me the option to restore an icloud backup from 2021 why?"

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Why iPhone Restore may not Work:

You can only restore your iPhone from a backup that is of the same iOS version that is currently installed. So, you've upgraded to a newer iOS version. You cannot downgrade iOS versions, as of this date.

iCloud backups deleted after 180 days if you stop using the feature.