It's easy to be able to trace your family tree if there are documents or something written. Oral tradition cultures are a little more difficult to trace.
I just started a genealogy on both sides of my family and have gone back about 400 years for each.
If I had $10,000 I would get a human genome test done to find out what my original ancestry was.
Family records are another thing. Many of these have not survived the years or did not exist in the first place, and any photographs will only go back to the mid-18OO s when photography was invented. Because many of the early photos were done with silver film on acid paper, they did not last.
So far I can trace back to the American colonies, England, Ireland, Switzerland, Germany and the Middle East, but no specific countries or regions there yet.
Family heritage through genealogy is fun. It lets you know something of how you came to be you.
If you want to know more, the Mormons are the best at doing genealogy and have been doing it for years for much of the world's population.