Hello Mehrdad,
You don't need Garmin Pilot to upload your flight data. You can log into your FlyGarmin account, click on the Logbook feature at the top, then click on "Upload Flight Logs" to upload any of the SD card stored flight data logs collected by your G3X or G3X Touch system to create an entry in your logbook.
Really quick and easy way to see your flight on the map and all the engine and flight parameters. It even shows the flight director and armed/active autopilot modes as you re-fly your flight or instrument approach. The lateral and vertical deviation bars are shown on a mock PFD so you can see how well those were centered when flying an LPV or ILS approach.
In this example from my FlyGarmin Logbook I am re-playing an LPV approach that was flown last week. The GP is captured, the plane is 2.8 nm from the runway, and since the needles are both centered, you can tell the autopilot is flying!
You can and should save your fuel probe calibration data to an SD card as explained in the installation manual so you never have to re-fill the fuel tanks should you lose your configuration, but for the rest you should retain a set of screen shots or video to capture your configuration settings. Your configuration is safely stored in the configuration module in the PFD backshell, so even if you replace one or more displays, the configuration is retained.
Thanks,
Steve