xcellent question about preventative stuff for backs....
In retrospect and from what I have learned....I would strongly suggest everyone do Pilates that focus on your core or look up core exercises to strengthen your back muscles.
Things like doing the plank position or simple back exercises will hopefully keep your muscles strong.
You can even search core strength or back exercises on you tube and there are some good instructional videos.
I thought I was pretty fit, young etc but in retrospect I wish I had done some core workouts and listened to my body sooner rather than just taking the Advil to stop the pain.