I use MAMP for my local Backdrop development on MacOS.
If you would like to do the same, first download the most recent version of MAMP and install it locally. When you are done, you should have directories for both
MAMP PRO in your
To run the application, double click
MAMP.app inside the MAMP directory. Once it's up and running, you should see a MAMP widget with a cute elephant icon.