Restoring Older Backup Items

After a major Windows 10 crash I had to reinstall a whole new OS. But, when setting up WD Discovery on the new system, I did a backup that essentially contained no files. When updating my Outlook, I was able to find my .pst files using Search in File Manager. However, when I try to restore my Music, Photos and Videos using WD Restore nothing of course was restored as my only option was that most recent backup. How do I get to previous backups from my older Windows installation that are still on the drive?