Hi
Try a reboot press the power button down &menu button hold both down until you see apple logo.
If you have iPhone 7 press power button down &the side down volume button Hold both down until you see apple
Then go to iCloud make sure iCloud back up is on Then backup now over your wifi
When you charge an iphone / ipad it will automatically be backed up to iCloud.
Also make sure you have enough space on iCloud I pay 0.79p per month for 50G
Cheers
Brian
🇬-1F1E7;