Saving the blender render after its finish is a little more complicated that saving a animation frame.
But you can do exactly that with a single render - consider it a one frame animation.
But if I have multiple cameras to render over night and save them - you can do the same but for every frame bind a camera to a marker:
1. Go to frame 1
2. Name a camera to Camera1, select it and Ctrl+0
3.In Timeline Window press M key to add a marker and Ctrl+B to bind Camera1 to Marker 1
...Repear 1,2,3 for every camera
4.Set the animation as long as the number of markers you have [or cameras]
5.In Render Pane>Output enter location and file name [ex:png] and file type, ex: //camera [will render in the same folder as the file as camera001.png, camera002.png etc
6.Press Animation. Wait for render. DONE.