create bootable usb backup
hello there,
I've been trying to make a bootable backup of high sierra in order to do a clean install on my Macbook. I have read different websites ans all of them tell me to do it with Terminal. I've tried several times to put in the exact right command but it keeps coming back as : command not found
Help please....
MacBook Pro (13-inch Mid 2012), OS X El Capitan (10.11.6)