If you hardwire flexibility into your core company values, it will make things much easier to pivot later when you need to. Make a point to mix things up as much as possible. A new office layout, random events and shifting roles can keep things fresh for your team and prepare them for bigger changes when they come. Build an environment where everyone can comfortably go with the flow and you might actually survive a major company transition.
While backup plans are never a bad idea, they consume a lot of time and are unrealistic to outline for every operation. I propose a blanket backup plan: be flexible. Accept in advance that things happen beyond your control. Be prepared and practiced enough to make alternate plans quickly. Those who can accept change, keep cool, and think on their feet stand a better chance at getting things done. Furthermore, an open mind radically reduces stress and can open doors to better possibilities outside the original plan.
Embrace flexibility. It may very well be the key to a more fruitful, healthier life.