LR4: export folders to JPG, keeping structure

Hi guys

I'm looking for a way to let LR4 export all of my pictures in a certain folder (for example e:\pictures\2012 with subfolders per date) to JPG's in a different location. Main reason I want to do this, is to be able to easily make an online backup of my most precious pictures.

Problem is, Lightroom doesn't seem to enable this. I can only select individual files for export, not complete folders (and subfolders). I've also found a small plugin which allows this (jf Folder Publisher) but here I also need to add each picture individually. I'm looking for something which scans the 2012 folder (for example) by itself and put new pictures to the export list.

Any way do this ?