Can't you just minimize Octane?... it will keep rendering, no?...
Yes.........Unless you forget to do it!

While it was open, I naturally had left the render node selected. So when my parrot stepped on the keyboard, he just happened to land on the delete key. LOL! Out of 110 keys, he just happened to choose the keys in the delete key neighborhood.
From now on, I think I'll do two things: Deselect the render node just to be safe, and minimize Octane. Which should always work...Unless my parrot figures out how to restore the Octane window, reselect the render node, and hit delete.

Win7 | Geforce TitanX w/ 12Gb | Geforce GTX-560 w/ 2Gb | 6-Core 3.5GHz | 32Gb | Cinema4D w RipTide Importer and OctaneExporter Plugs.