This site is being deprecated.
Please see the official X‑Plane Support page for help.
I am not able to give you an official answer but I offer the following comment.
My PC setup is as follows:-
1. dedicated SSD "c" drive for my operating system and drivers;
2. dedicated "D'" drive for my "cd/dvd's";
3. dedicated SSD "E"drive totally for the running of X-plane 10;
4. dedicated "F" Hard Drive which is my "Hangar" drive used specifically for a "total" backup of X-plane 10. If and when X-plane is updated I copy the directory from my "E" drive to the "F" drive. This drive also contains all other software and or garbage I want to use other than X-plane.
In due course I want to delete all scenary and aircraft I consider I will never need or require from the "E" drive but I will still have that information on the "F" drive as a backup if I chose to utilise a particular aircraft or scenary area in the near future. In other words I will not be doing a total delete from my computer. The unnecessary files will be out of the way.
Not knowing what type of computer you have you may chose to do the same by adding an additional drive or add an external drive as an additional "hangar" backup drive for your system.
One thing you will need to be aware of is if you do an upgrade the "missing files" will be reinstalled with the upgrade. Refer to the following from Wycliffe Barrett https://www.youtube.com/watch?v=l9wubukUlxI . I have no connection with Wycliffe at all.
Hope this helps in considering what to do after/when you receive an official reply to your question.
You can remove unwanted scenery in two ways:
If you choose to locate the individual files and move them, you would not have to re-download them again to "re-install" them. Simply move them back into the Global Scenery folder you found them in originally.
This site is no longer being actively maintained.