If you haven't played the other Raze games, they use an online save that links to your Armor Games account and save your progress permanently. This doesn't exist on the first Raze, so the only thing you can do is to makes sure your cookies aren't deleted. Hope this helps.
@Patata_Cake what Gogotank said above is partially accurate However you can always backup your save files
You can find your save files in the paths detailed here, depending on your browser. Get there, copy them and if you erase your cookies or they are deleted after a certain period, copy them back into their respective folders xD
