Duplicating a job means cloning the job and publishing it as new, with a clean selection process (without the information of the professionals who originally applied).
If you have a subscription plan, you will be able to access the applicants' information immediately. If you do not have a subscription, you will have to unlock your job to access the applicants' information.
You must go to your closed processes from your jobs panel and click on the "Duplicate job" button to duplicate the process.