Glad you got it working again.
And good work with the backup - everyone should make a backup of any changes they make as files can become corrupted at any point - not just in PT3, but any important files!
The files you need to backup in PT3 are:
C:\Program Files\pokertracker 3\data\layouts.pt3
C:\Program Files\PokerTracker 3\Data\StatDefinitionsCustomized.pt3
C:\Program Files\PokerTracker 3\Data\ReportsCustomized.pt3
C:\Program Files\PokerTracker 3\Data\Config\Buddies.cfg
As well as your hand histories and/or databases.
Database / Postgres FAQ