|This is normal when you have one pst open and then open another one. You first have to check that you want to see the contacts of the other pst file.|
Go to your contacts, there should be something with contacts in backup.pst
Other way to show them is to click in you navigation menu on the left on the small button that shows a folder and says folderlist.
Then you can copy the contacts of the backup pst to the repaired one and you are done also. You need to open both pst files to copy them or drag them from on to the other.