There are several reasons to explain why iPhone won't backup to iCloud, you can check the following aspects:
1. iCloud backup feature only works with Wi-Fi network, instead of cellular data. If you are using a cellular data, you should switch to an available Wi-Fi network.
2. iCloud backup feature is turned off on iPhone settings. If so, you should turn on iCloud backup on iPhone.
3. iPhone needs to be plugged to a workable power source. If so, simply plug iPad device to an available power source.
4. iCloud storage is not enough for the backup. If so, you should delete old iCloud backup for new backup files.
Bonus Article: Quick Fixes to Common iCloud Issues
If your iPhone is not able to backup to iCloud, you can follow the steps to check and fix the problem.
Above all, what you should do firstly is to make sure you have connected to a strong Wi-Fi network. To get a better signal, you'd better go closer to the router - the Wi-Fi source.
Then you need to check if the iCloud storage of your account is available for a new backup:
- Go to Settings > iCloud > sign into iCloud accountwith Apple ID and passcodes > Storage to check the available iCloud storage.
- Go to Manage Storage > Backup, iCloud will help you estimate the size of the next iCloud backup so that you can know if you have enough available iCloud storage for creating a new iCloud backup.
- If there is no enough iCloud storage for the next backup, you can choose Delete Backup option to free up room for next backup or make a smaller backup by selecting less contents to backup.
Or you can also buy more iCloud storage: Settings > Sign in with Apple ID > iCloud > Storage > Manage Storage > Change Storage Plan.
Can't Miss: How to Sync iPhone over Wi-Fi
If you get a message stating "The last backup could not be completed" or your iPhone won't backup to iCloud automatically, you can backup your iPhone to iCloud manually by yourself.
- Go to Settings on your iPhone
- For iPhone with iOS 10.2 or latter, sign in with Apple ID > iCloud > iCloud Backup > Back Up Now;
For iPhone with iOS 10.1 or earlier, tap iCloud > Backup > Back Up Now.
Can't Miss: How to Backup and Restore iPhone?
When iCloud backup feature is unable for iOS device, there may be some problem to enable iCloud backup feature for account verification. If so, you can try to sign out iCloud account and then get back to iCloud account to see if the problem is fixed or not.
- Sign out iCloud account:
For iPhone with iOS 10.2 or above, go to Settings > sign in iCloud account with Apple ID > scroll down to tap Sign Out to log out of iCloud account.
For iPhone with iOS 10.1 or earlier, choose Settings > iCloud > Sign Out.
You'll be required to erase all settings on iCloud, including the iCloud account and passcodes. Just confirm it and you'll be successful to log out of iCloud account.
- Now you might log in to your iCloud account with your Apple ID and passcodes. After that, check if the iPhone can be backed up to iCloud.
Can't Miss: How to Sync iPhone with iCloud
Resetting all settings on iPhone will erase system settings like Wi-Fi network & passcodes, iCloud accounts & passwords and etc. But it will not delete the files on your iPhone. To do so, you can:
- Go to Settings > General > Reset > Reset All Settings on your iPhone.
- Confirm your action by entering the passcodes.
After that you can try to backup your iPhone to iCloud again.
Words in the End:
Besides iCloud, there is an alternative to iCloud for backing up iPad, iPhone & iPod touch. Just refer to the simple guide to backup your iOS device in case of further needs.