In the event that a student has resubmitted their Turnitin submission, it is not possible to restore the overwritten version(s).
When students resubmit, either by the instructor deleting their paper or allowing resubmissions in the assignment, the previous version of the paper will be overwritten by the latest submission, including any marking or grading applied before the resubmission. Unfortunately, overwritten versions, marking, and grading cannot be recovered.
To keep multiple drafts, an instructor may create multiple assignments (named draft, revision, final, etc.) and have students submit each revision of their papers to each assignment.