There is :CopyRegion and it throws back TerrainRegion, and i was wondering if i can save this somewhere as a value of some sort to use later. Because it would be bad to make maps then copy and store then erase terrain on startup.
So yeah. Where can i store TerrainRegion type values?
I hope this will help you
Using this method or the TerrainRegion method will have a different impact ?
Sorry, late reply. But this might help, and i’ve seen how many people visited this topic. They might have helped themselves with this information.
Marked as solution and thank you for your time.
I know the solution was already marked but I’d just like to add that this plugin by sleitnick makes terrain loading easy.
It’s a plugin but there’s a button that allows you to download the scripts needed to perform the actions. It saves whatever terrain you have loaded, turns it into a TerrainRegion, and you can use a script to load it.
Read and WriteVoxels are awful to work with in my opinion and the wiki documentation on them isn’t super helpful.
Solution switched 
I didn’t expect this to get this much attention.