Does anybody know where it is so I can back it up onto my other machine, pls ^^ ?

This looks like the path to the save folder:
...Users\[Username]\AppData\LocalLow\Maximum Games\Curved Space

I've also noticed there is save file information in the Registry at:
HKEY_CURRENT_USER\SOFTWARE\Maximum Games\Curved Space

Can someone else verify which location holds the actual save data for Curved Space?