marlin 1.8 questions

Hello, first post.
I think I have the most recent version of marlin. I though there is a way to export or import your bed leveling points but not sure where that option is hiding, I use either cura or simplify3d…
Also want to clarify, is it necessary to run bed leveling each time you power on the printer. I think it would be. Here is also a detail I’m not sure of. When the printer is powered I don’t think it necessarily means the steppers are enabled and holding, if not then one side or the other can coast if you accidently do something or gravity wins a little…
When would one want to save and load settings for sure.
Thank you.
Best practice is to include the G29 command in the initial gcode at the start of each print, so the bed is leveled every time.