Won't Backup

So a few months, I had to get my computer fixed.  The store recommended to buy a Passport Esst. to backup my files just in case.  They backed up my files while at the store.  About afterwards, when I tried to do my own backup at home, it won’t happen now.  My computer does read that there is a Passport and files are in my Passport too.  However, when I click the “Start Backup”, nothing happens.

Please help.

Did you ever get help on this?