If someone is new to the Qt-based wallets, just a short reminder on how to backup the private key (from your receiving wallet address):

1. Launch pigeon-qt.exe
2. From top menu click on a Help and pick "Debug window"
3. Select the "Console" tab
4. If you have previously encrypted your wallet (you always should!) type:

walletpassphrase [yourpassphrase] 600 (should receive "null") and then type:
dumpprivkey [yourPGNreceivingaddress]

5. Copy the private key and store it safely. Type walletlock into the console windows to relock the wallet.