iPhone 10 will not auto backup

1. Do you have enough free space on iCloud to conduct the backups? Open Settings ➔ Apple ID (Your name at TOP) ➔ iCloud to check.
2. Automatic Backups require your iPhone to be plugged into power and connected to Wi-Fi. Generally happens overnight when the iPhone is at rest.

Axel F.

You are using iCloud. Do you have enough storage space?