I use "folder mount" as a way to move folders from my device to my sd card. I bought the app.
I'm not real sure if tibu can move them. But, to find out, go into preferences, scroll down to backup folder location and click on it. See where it has your back ups going to. If it is not to your external sd card, see if you can create a path to it. I'm not sure if it will or not, but look at it and see. Other than those two suggestions, I guess you can take the ota update as that is supposed to let you move things to the sd card, I think.
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