Does anyone know how to wipe everything on the Android and only save the settings, like the fonts settings, sizes, etc?

As Deja has worked fine for me, but recently has been acting up.
Now everything works EXCEPT Android-Calendar appointments entered on the Android. Every other function works, and these appts seem to show up as blank.
I have no idea what went wrong.

I figure doing total re-installs is the only way, but I want to save my settings.
Are they part of the database, or separate?

I had to downgrade Deja a couple of versions to what used to work for me, as the current one just eats up the entire tablet, doesn't work at all, too much stuff going on.