Miller won the Vezina Trophy as the NHL's best goalie in 2010, the year he was the Most Valuable Player of the Olympic tournament in Vancouver. He's the franchise leader with 284 victories and 540 games.
The Sabres acquired Ott from Dallas along with defenceman Adam Pardy in exchange for Derek Roy on July 2, 2012. Ott had 18 goals and 26 assists in 107 games for Buffalo.
The deal is the Sabres' first major move since general manager Tim Murray was hired in January after Buffalo fired Darcy Regier.