No one should feel nervous because of Brandon Backe. Backe has NEVER been effective pitching in relief, and hasn't looked great in his rehab assignments. Of course neither did Moehler, and he's back in the rotation.
And while it's disappointing that Geary is floundering this year, it's not ever really surprising when a relief pitcher isn't consistent year over year. It's part of the reason that they ARE relief pitchers.