Impossible to select disk nvme for image full

Hello,
I try du backup my dell 5500
Control is Intel chipset rst premium. Disk is an nvme
When I want to backup in full image, I can't select disk source.
Have you some idea ?
I try du backup my dell 5500
Control is Intel chipset rst premium. Disk is an nvme
When I want to backup in full image, I can't select disk source.
Have you some idea ?