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If your iPhone says “last iCloud backup could not be completed,” check its Wi-Fi connection, install any available iOS update, try another Wi-Fi network, and compare available iCloud storage with the backup’s estimated size. The alert does not identify one specific cause, so work through these checks rather than assuming storage or network is necessarily the problem.
Check Wi-Fi and try another network
First, open Settings > Wi-Fi and confirm that your iPhone is connected. If it is, try completing the backup while connected to a different Wi-Fi network. Apple recommends testing another network as a troubleshooting step; it does not guarantee that Wi-Fi is the cause.
Apple’s instruction is: “Try to complete the back up on a different Wi-Fi network.” (Apple Support)
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Check for an iOS update
Open Settings > General > Software Update. If an update is available, install it, then try the iCloud backup again. This is another check, not proof that outdated software caused the alert.
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Compare iCloud space with the next backup size
Check how much iCloud storage is available and how much space the iPhone estimates the next backup will need:
- Open Settings, tap your name, then tap iCloud.
- Review your iCloud storage use, then open Storage or Manage Account Storage.
- Tap Backups, then select this iPhone.
- Wait for Next Backup Size to appear. Apple notes that the estimate may take a few minutes.
If the estimated backup size exceeds the available storage, Apple’s options are to reduce the information included in the backup or upgrade the iCloud+ plan. Its instructions do not recommend deleting the existing backup as the first step.
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Retry the backup after the checks
Once you have confirmed Wi-Fi, installed any available update, tried another network if possible, and checked storage, try backing up again. These checks cover distinct possible obstacles; Apple’s guidance does not say that every failed backup has the same cause or that any one step will resolve every case.
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Apple’s instructions for this alert focus on Wi-Fi, software updates, and iCloud storage. They do not identify a physical product as a fix. See Apple’s iCloud backup troubleshooting guidance for the official steps.
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- WHAT’S IN THE BOX — Apple USB-C Woven Charge Cable only. Power adapter sold separately.
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