You can backup the import file prior to it being processed to ensure that the process format and its preprocessor were configured correctly and no data is lost or damaged in the import file.
If a file already exists in the backup location with the same name as the import file you are trying to backup, the import file will not be processed unless the Create Unique Subdirectories option is selected.
Tip:
It is considered a best practice to always select the Backup Path check box.
To enable the backup-prior-to-processing option: