Tree roots don't attack sewer lines. They follow moisture, and a sewer line with even a hairline opening at a joint is one of the most reliable moisture sources in the yard. One root finds the opening, follows the moisture, and gets inside. Then it keeps growing. A thin root becomes a mat, the mat catches everything passing through, and eventually the tub backs up.
Cutting the roots out fixes the symptom, not the cause. A cleared root mass grows back from the same opening, so if clearing is all that ever happens, the backups keep coming. Breaking the cycle takes 2 steps. Clear the roots, then deal with the opening they used, and the camera helps show where that opening is and what sealing it will take. Sometimes it's one joint and sometimes it's a section, and the footage shows which.
Every step is explained in plain English, every option is laid out with its tradeoffs, and the decision is yours from start to finish.