Visual Composer Undo/Redo is an add-on for WPBakery Visual Composer that bring a missing and useful feature: the standard Redo/Undo buttons. These buttons will now be shown in your visual composer editor and you can undo/redo your most recent changes the same way as you do with the classic wordpress text editor.
Demo: http://codecanyon.net/item/visual-composer-undoredo-buttons/9639215