Yep, and i would add 2 more things if using GSX2:
1) Backup your SIM.CFG @ C:\Program Files (x86)\Addon Manager\Simobjects\Misc\FSDT_SODE_jetway_logo
This one might contain information regarding your LOGOs for specific jetway customization, and after restart and update, just add lines in sequence after the last number and remember to put textures folder back in according to your customizations...
2) Backup Gate vehicle position customization: You got to enter each scenery you performed your MODs, but its time saving if you do. (I think it works for GSX1 too)
But i have a question: I wonder if step 2 is a valid backup for re-formating the PC and/or what else should it be backed up besides what is told above... Is it really going to work?? Wont have problems with coordinates or something like that after just pasting files in the sceneries "Scenery" folder?
Now that Windows 10 1809 is about to be officially released, is possible that i give it a try after a while but id like to back everything up before.....
Thanks in advance...