I use the free software “Etcher” on my Mac to burn SD cards from image files.
It formats/burns SD cards properly for Pis, unlike Disk Utility. It is easier to use than Terminal, too. Try it:
Edit: Just realised the OP wanted to (presumeably) clone his card completely, including settings, etc… Etcher won’t currently do that - it only burns cards from images. However, saving cards as images (i.e. backup), and then burning another clone card from that image - IS on the developers to-do list. So, watch that space!