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I found the save game files:

C:\Users\[Username]\AppData\Roaming\HelloGames\NMS\DefaultUser

You can copy them over to another PC and fire up your game on a different system and all your progress and inventory is copied over BUT....

Your discoveries are not. Seems like those are tied to the first system you installed it on.

Can't figure out what file they are tied to. Until I do, I can only play it on the one PC. If I play it on the other any discoveries there will be logged under a different user than the first PC and vice-versa.

Kinda irritating....