I agree, you need to found out WHY first, before any treatment can be effective.
All the above described treatments can and are very good, but it depends on what is wrong and where.
I have had serious back problems for 33 years, mainly L5 the result of a horse falling on me.
All of it has been done (treatments) at one time or another, but no surgery.
Keeping my weight down and keeping my back strong with lots of walking and exercise has always been the best treatment for it.
When my back pitches a fit, I have to sleep in a chair (can't lay flat or on my side, let alone get down that far or up again later lol). And when it is bad, I can't pick up my feet more than about 1/4 inch off the ground, so I shuffle when I walk, but walk I do, no matter how much it hurts. Walking helps for me, but that is me. When my back goes, thankfully it only does that once every 3-5 yrs and it lasts typically for a year or more, with extra treatment including hospital stays and chiropractic it does get better again.
You have to find out why and where, then find the best possible treatment for that works and that can take some trial and error, as each problem and patient is different.
Good luck, btw don't screw around with your back...............