In volatile markets, dividend stocks offer investors predictable income and stability. And when these dividend stocks are backed by Warren Buffett, arguably the greatest long-term investor of all time, the appeal becomes even stronger. Buffett has long valued companies with strong brands, consistent cash flows, and the ability to pay investors regardless of the economic cycles.Here are two Buffett-backed dividend stocks to buy in April. Buffett Stock #1: American Express (AXP) American Express (AXP) is ...