As someone recovering from back pain from a car accident, back pain (or tightness) often just means there's a weakness somewhere, probably at or anywhere below that location (could be tight hips, even ankles).
It's finding that weakness that can sometimes be the hard part, but deadlifts use the whole damn back so they're great to cover that area.
That being said, the body loves to try and compensate, so I didn't find proper relief with home workouts (and often just aggravated things), I needed all the gym machines to properly isolate muscles so my body wouldn't try and cheat. Trying random machines is also a great way to identify weaknesses.
