Problems with iCloud Backup on iPhone X running iOS 14.0.1

Have you tried using another WiFi network to back up? When you turned the iCloud backup off, did you restart the phone and them turn the backup on again?

If you have tried all of the suggestions in the support article that zinacef posted above, and tried my suggestions, try a forced restart

• iPhone 8 or later: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then press and hold the Side button until you see the Apple logo.
• iPhone 7, iPhone 7 Plus, and iPod touch (7th generation): Press and hold both the Top (or Side) button and the Volume Down buttons until you see the Apple logo.
• iPad with Home button, iPhone 6s or earlier, and iPod touch (6th generation) or earlier: Press and hold both the Home and the Top (or Side) buttons until you see the Apple logo.

If that still fails, try rebooting your router. It might not help, but it can’t hurt. If that still fails, use the contact support link in the upper right corner of the page and ask Apple for help.

If a backup cannot be completed -- If you can't back up to iCloud or restore from iCloud backup failed - Apple Support.

I did it. I switched off and on my iPhone and it worked 😀😀😀

aburdick wrote:

I'm having problems running iCloud Backup on my iPhone X running iOS 14.0.1 - a backup has not been completed in the last 3 weeks. When I click "Back Up Now" on the Settings > iCloud > Backup page, I receive an error message stating simply that "The last backup could not be completed."

I have iCloud Backups enabled; I have tried turning iCloud Backup off and then back on, with no luck. I have tried restarting the iPhone, and that did not work either. I pay the extra dollar for 50GB of iCloud Storage, and have plenty of storage space available (6.7 GB of 50 GB available; next backup size roughly 8.44 GB). I back up everything, including my Photo Library.

I have an iPad Mini 5 running iOS 14 as well, configured the same way, and it is backing up with no problems.

Does anyone have any suggestions about what could be causing this error, and how to resolve it?

If you only have 6.7GB of storage available and the next backup size is 8.44GB, you don’t have enough storage to complete the backup.

I have exact the same problem as my friend above. Please help.

I’m glad to hear that you were able to finally backup your phone.

Excellent. I’m glad to hear that you had success.