When using a large bit, like this 2" Forstner, clamping is absolutely essential. A shop-made fence makes it easier to clamp at the rear, and small spring clamps are ideal for this purpose. To clamp at the front, or for drilling small pieces, I use a Kreg clamp that attaches through one of the slots in the table. For larger pieces, I use conventional clamps and supporting boards, if needed. For the project shown, my clamps were just deep enough to reach the workpiece.
With secure clamping, plus a backer board, you'll minimize or eliminate tearout, providing that your bit is sharp, of course!
