How do you lock your screen ? If my screen times out and goes black will the backup continue ?
What does it mean ( make sure your screen is locked )
if the screen blanks out while updating will the update continue ?
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For your device to automatically backup to iCloud while it is charging and connected to Internet, the screen must be locked. You can lock it with the side button or let it lock itself based on the time chosen in Settings > Display & Brightness > Auto-Lock.
For the Backup Now option, you don't need to lock it but if it locks, that won't stop the backup.