Sewer problems, back-ups, are the worst things to happen to our sewer lines. 90% of the time the cause is roots getting into the lines.  Most older homes have  red clay sewer pipes that run from the house to the street. It ties into the cities main line that runs down the middle of the street. In most cities you are responsible up to that tie in.
Running a sewer machine to clear a clogged line is a temporary fix. The roots just keep growing and getting bigger causing more damage to the sewer pipe. That's when we recommend Perma-lining the sewer pipe to fix the problem permanently.