You should be able to go into the wizard and get to you last unsaved preset, it should be available to you in the list. If you have saved over the preset minus your colors and do not have the last unsaved version available to you then you will need to edit the preset again to add in the missing parts. Whenever you are editing a preset and changing the values you should make sure to save new presets to maintain the changes along the way.
If you are making changes to the css directly you should back it up after any edits that you make.