Incremental Saves of Renders?

Is it possible to save a render but keep the rendering process going?
Example: I have a render that is at 70% convergence but it looks like it might be good enough. So I want to see how it looks after my post processing shenanigans but just in case it isn't quite ready I want to keep the render going.
Thank you
Comments
Try stopping the render, then go to File>Save Last Render.., then Resume the render. I've not tried this.
i'll do a test and see how that works.
well... you're making me want to try now...
Ok... I've learned a couple new things with this.
Thank you very much!