Retrieve files are OS update to Windows 10 (WD My Passport)

I have just upgraded my PC from Windows 7 to Windows 10 and when I try and run a backup to My Passport, it shows “other backups” but it wont add to that backup.
I also cant access the “other backup”, I assume due to my different OS.
What is the best course of action?

  • delete the “other backup” and start a fresh
  • add new backup leaving “other backup” in the memory (even though it appears I cant access it?!)
    Thank you