Before every migration it is good practice to backup your data safely!
You can backup your data using Wi-Fi.
Go to the Wi-Fi transfers section of your PocketMoney (in PocketMoney GT is the button at the bottom left in the main account screen), select Backup or Restore to desktop and follow the instructions.
Basically you have to open a browser with a computer under the same Wi-Fi network, insert the address displayed including the port number (e.g.: http://xxx.xxx.xxx.xxx:yyyy), and a username and password will be requested.
As username you can type whatever you like, as a password you need to input the pin security code of PocketMoney (if you have setup one).
You can now download or upload the entire database file.