You can save it from the install folder - it should be in the “Official” folder where you have your FS2020 folder.
Just look for the aircraft files and back them up elsewhere if you really want to.
I’ll show you one of mine so you can see…
The two highlighted folders are my Carenado purchases via Steam:
Whether there is more to them, I can’t tell you - but these are the main add-on folders. You may have your FS2020 folder in a different location.