How do you check your own aircraft to confirm it is operating correctly?
Retrieve the CSV file from FR24 just after your flight? You may need a "silver" FR24 subscription for that, which costs about $20/year.
Also when you install ADS-B, at least in the US, you are required to conduct a test flight to confirm correct operation.
For VFR flight, FR24 relies on ADS-B. Now that means everything flying, round here anyway, but until recently it generally didn't show small planes.