Why not copy the roots directory someplace else prior to doing anything to it. Then you can restore it if anything goes wrong.
With this method you can try several different ways to restore the files. Try just the projects and if you have a problem you can restore the roots directory from the copy or try restoring the library and image folders etc.
Worst case is restoring all of the roots folder including subfolders and then importing the projects that you saved in a different folder into that folder which should update the place files.
You might want to play around a little. I would also backup the current projects and library images etc prior to making the copy.
You may save the projects in a different folder. There are several ways to go. Good luck.