Yoga has been known to help with a lot of pain issues including back pain. My good friend has been totally freed of her back pain by doing yoga. She truly believed that she was destined to be in pain for the rest of her life.
Yoga stretches and strengthens the core area of one's body, promoting proper posture which is crucial for a healthy back.
I've experienced the back pain that arises from poor posture, and yoga can alleviate that.
Also, posture exercises can help. This site on
posture support offers info on corrective posture exercises, posture support braces, desk posture, etc. It provides some useful knowledge on how to maintain a healthy back.