Jankowski scored on a wrist shot from the high slot to make it 4-0 at 19:05.
"It was 4-0 after the first, but with 40 minutes, there's a lot of time there, so it was really important, we wanted to focus on getting the next goal," Anaheim defenseman Josh Manson said. "We didn't do that, and then we just kept slipping behind."
Backlund scored shorthanded at 16:46 of the second period for a 5-0 lead. It was his fourth goal in the past three games.
"When I wasn't scoring at the beginning of the season I would keep telling myself, 'My whole career I've been a second-half player,'" Backlund said. "Every year I have to tell myself that because for some reason I just can't put it in the net in the fall."