How to find backed up files

I bought a Passport Ultra 2+ years ago right before getting this current computer. I believe I backed up the old hard drive onto this Passport and I’m only now trying to find a photograph that I’m hoping is on this Passport. In trying to look through these files on the Passport, I’m very confused about what’s on this thing and its file structure.I have found a folder that is entitled Backup File and it has 209 subfolders. What is this file structure? And how do I navigate through his just to find what was actually backed up?

You’ll need to use the same software you used to do the backups to browse the file structure for individual files.