I have tried to do a backup using my IPad but it did not work.
How about a little more detail. What exactly did you try to do and how did it fail?
It tells me there is a backup as of today but I cannot see any files.
How are you trying to see the backups?
If you use Roon to view the backups, you will see them. If you look on your drive the directory the backups are stores is will not be visible.
Go to Roon/Settings/Backups and select “Browse”. Then go in to the directory where you have Roon saving the backups but no farther and click on “Select This Folder”. You will see your backups listed.