A note in JJO's Tidbits blog post that Backe will throw off the mound for the first time since slipping and straining his ribcage on March 8.
"Yeah, I mean, it's something different," he said. "It's another step toward normality. We're just getting up there and just throw. I don't know how long. I can throw everything, but I probably won't have enough time to throw everything."
It's been a month since Backe hurt himself and he's just now getting to the point of throwing changeups on the mound, so this looks to be a pretty long process.