This function duplicates a backup job by id and assigns a different name for the job.
jetapi backup -F duplicateBackupJob -D '_id=5b59d203d5ac5e651d0af502'
https://hostname.example.com:2087/cpsess##########/cgi/addons/jetbackup/api.cgi?function=duplicateBackupJob&_id=5b59d203d5ac5e651d0af502