How to Fix an iCloud Backup That Cannot Be Completed
An iCloud backup that cannot be completed usually results from insufficient iCloud storage, unstable Wi-Fi, low iPhone storage, outdated iOS, or a temporary Apple service issue. Checking storage, charging the iPhone, restarting the network connection, and installing available iOS updates usually resolves an iCloud backup that is not finishing.
Steps
- Check iCloud storage: Open Settings > [Apple Account] > iCloud and confirm that enough space remains for a new backup. Remove unnecessary backups or upgrade storage when required.
- Use a stable connection: Connect the iPhone to reliable Wi-Fi, plug the iPhone into power, and keep the screen locked. Automatic iCloud backups require Wi-Fi, charging, and a locked device.
- Review backup settings: Open Settings > [Apple Account] > iCloud > iCloud Backup. Confirm that Back Up This iPhone is enabled, then select Back Up Now.
- Restart and update: Restart the iPhone and install available updates under Settings > General > Software Update. Retry the backup after the update finishes.
Common Issues and Fixes
- “Not enough iCloud storage” appears: The backup size exceeds available space. Delete old device backups, reduce large app data, or add iCloud storage.
- The backup remains stuck: Weak Wi-Fi or a temporary network error may interrupt the process. Restart the router, reconnect to Wi-Fi, and retry while the iPhone charges.
- An iPhone backup failed iCloud repeatedly: Outdated iOS, corrupted backup data, or an Apple service interruption may be responsible. Update iOS, restart the iPhone, and check Apple System Status.
- Only selected data fails to sync: Individual apps may have disabled iCloud access or unusually large data. Open Settings > [Apple Account] > iCloud and review app synchronization settings.
- Backup stops after a long period: Low device storage or a very large photo library can delay completion. Free local storage and allow the iPhone to remain connected to power and Wi-Fi overnight.
💡Protip:
A cellular connection cannot normally replace Wi-Fi for an automatic iCloud backup.
Recent photos may continue uploading separately through iCloud Photos after the device backup completes.
Signing out of iCloud should not be the first step because account data may require re-synchronization.
Apple service outages can cause an iCloud backup not finishing even when device settings are correct.
Related Questions
Why does iCloud backup say it could not be completed?
The most common causes are insufficient iCloud storage, unstable Wi-Fi, outdated iOS, or an Apple service interruption. Checking storage and retrying after a restart resolves many cases.
Can an iPhone back up without iCloud?
Yes. An iPhone can be backed up to a Mac or Windows computer using Finder or Apple Devices. MobileTrans can also provide an alternative for transferring or backing up selected phone data when iCloud storage is limited.
