Wild forward Jason Pominville also missed Thursday's practice and will not travel to Chicago for Friday's game. He missed Game 1.
Coach Mike Yeo says if Backstrom is unable to go, Josh Harding will get the start on Friday night after he made 35 saves in Minnesota's 2-1 overtime loss in the opener Tuesday night.
Blackhawks centre Dave Bolland and goalie Ray Emery have been ruled out for Game 2 due to lower-body injuries. But Emery skated on Thursday, and coach Joel Quenneville says both players could travel to Minnesota for Game 3 on Sunday.
I don't know how he does it. I don't know how he gets his body parallel with the player and pulls it through his legs like that. I know he's tried it a couple times in practice and it's never worked, so how he does it in a game, it's incredible.
— Capitals defenseman Mike Green on teammate Alex Ovechkin's highlight-reel goal against the Devils on Saturday