Auto Fix wont delete your files instead it will be moved to a sepcial folders called ".duplicates" and keep the folder structure intact.
For each folder it creates ".duplicates" folder, which contains duplicates found in the current folder(files compared with other folders in search)
Some case you want to revert the Auto fix it is easy to do.
Note: All these are not from DupFinder software. These things may slightly different for each OS(Ex: Windows7, Windows8 and Windows10) You can use command line or terminal to do things.Windows OS:
Ubuntu (Linux)