Restoring your PWC data backup on the Mac.
To restore the PWC data backup on your Mac, please follow these instructions. What you're going to do is replace the existing data file with your backup file.
Open your Applications folder.
Locate The Personal Wine Curator folder.
If PWC is running, Quit the program. The Personal Wine Curator cannot be running for this next step.

Double-click The Personal Wine Curator folder to open it. Now move your BACKUP DATA FILE into the Personal Wine Curator folder.

You should receive a dialog window asking if you want to replace the file that is already in there. Click "Replace."
Okay, now relaunch The Personal Wine Curator. It should be authorized and have all your data. (If you have not yet authorized your software, you may do so now.)