Note: Files are extracted over existing files. After install, the destination folder will contain a combination of the old site files and the files extracted from the archive.
This option is the most conservative option for those who want to make sure they do not want to lose data.

Note: Before extracting the package files, all files and folders in the installation folder will be removed except for folders that contain WordPress installations or Duplicator backup folders
This option is recommended for those who want to delete all files related to old installations or external applications.

Note: Before extracting the package files, all current media files will be removed (wp-content/uploads)
This option is for those who want to avoid having old site media mixed with new but have other files/folders in the home path that they don't want to delete.

Note: Before extracting the package files, all current WordPress core and content files and folders will be removed (wp-include, wp-content ... )
This option is for those who want to avoid having old site media mixed with new but have other files/folders in the home path that they don't want to delete.