Saving your game in Metroid Prime 2: Echoes is done at designated Save Stations scattered throughout Aether. These stations are easily identifiable by their glowing blue energy and a distinct sound. When you interact with a Save Station, your progress is recorded, and your Energy Tanks are fully refilled. It's highly recommended to save frequently, especially before entering new, potentially dangerous areas or after acquiring a significant upgrade.
There are no auto-saves in Metroid Prime 2, so relying solely on your memory can lead to frustration if you're defeated. Always keep an eye out for Save Stations and make it a habit to use them. Dying will send you back to your last save point, so regular saving can save you a lot of backtracking and replaying difficult sections. Some Save Stations are hidden or require specific abilities to reach, encouraging exploration.