Backup Validation

If those were my own files and are really important to me, I would right-click on each folder and check the Properties such as the size of it and the number files/folders on it then I would even thoroughly check every folder on the destination NAS and compare it from the source NAS. I would even try to open a file or play videos to check if it will run fine. - This way of checking would really take time but this is just my own way because I do it.