Checking the option to create a backup will duplicate, before conversion, all selected files. A directory can, in this case, be specified by browsing the    . As a precaution, it is useful to check this box even if it slows down processing.

However, if you have already made a backup before the launch, you can uncheck this option.

Attention   If there is a tree structure with subfolders in the selected directories, it is not reproduced in the backup directory.