Hi how i can back up all my photos back ?

Tap where the arrow is pointing and on the next screen, slide Photos syncing off.

I'm not sure I understand what your question is. If you want to backup your photos to a backup instead of syncing iCloud Photo Library, turn Photos syncing off.

Go to Settings/Your Name/iCloud and tap Photos on the right side of the screen > and you should be able to slide syncing off (not green).