Learn the differences between deleting, erasing, and overwriting according to digital forensics. We examine the steps a forensic analyst would use to both recover deleted files and permanently delete those they want gone forever. If you want to be able to recover a deleted file, use encryption to prevent uninvited eyes from opening them. There is no method of deletion that I would trust 100 percent. At this point, there is no way of recovering overwritten data. Take note that this procedure could turn out to have turned out to be useless if any type of automatic backup system is in place.”]
Source: https://blog.malwarebytes.com/security-world/2017/10/digital-forensics-recovering-deleted-files/