These act like physical GameCube memory cards. They are best for long-term progress as they mirror original console functionality.
Dolphin emulator offers a feature called save states, which allows you to save your game's current state instantly. save data nfs underground 2 dolphin emulator
Press Shift + F1 through F8 to save to a specific slot. Load: Press F1 through F8 to load that specific slot. These act like physical GameCube memory cards