set (someone or something) back from (someone or something else)
To place someone or something at some position or location a distance away from someone or something else. Make sure you set your cups and plates back from the edge of the table, because our toddler is in a phase of grabbing anything and everything she can reach. The teacher set us a good bit back from the performers since they were using pyrotechnics in their show.
set something back from (something else)
and set something backto place something at some distance from something else. Set the glasses back from the edge or they will get knocked off. You should set back the crystal vase a little. It's too close to the edge.