TS3992 Why did it say " Backup could not be completed"? Was it because it estimated it would take 3 hours to do the backup and it was timed out?

Why did it say "Backup could not be completed"? Was it because it estimated the backup would take 3 hours and it timed out?

Welcome to the Apple Community.
First check that your device is correctly connected to the wifi/internet (settings > wifi)
If your back up continually fails, you might try turning off back up on your mobile device (settings > iCloud > storage & backup) and then deleting the backup file from iCloud by swiping the backup file on the mobile device (settings > iCloud > storage & backup > manage…) and then turning back up on again.
If this doesn't help, try turning off some items for back up in a pattern to try to establish if your problem is being caused by specific data on your device.
Being able to back up to the cloud can be very useful, especially if you don't have access to a computer or have infrequent access to one, however unless you specifically need to use iCloud for back up, you will find backing up to iTunes significantly more convenient and possibly more reliable.
More about iCloud v iTunes Back Up

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