There will be days in which you can't work as you can today—you fall sick; there's an emergency; your laptop breaks.
The answer to the question Do you have a plan? is often No, and we realize we need a backup plan when it's too late.
Because we assume tomorrow will be the same as today.
Don't plan for your craft to go wrong.
Plan for the conditions required to do your craft to go awry.
And remember, there's only so much you can plan for.
That's why we call it the unexpected.
I'm starting to think this way more and more even for my side projects; schedule a publication here and there for the times of the year when you know you'll be swamped by work or on vacation.