A: Yes. On Steam Deck, your RE4 save is located in /home/deck/.local/share/dolphin-emu/Wii/title/00010000/53423445/data . Use Syncthing to sync this folder across devices.
While convenient, relying solely on save states is discouraged. Users on Reddit and Dolphin Forums have reported issues where save states can become corrupted or incompatible after emulator updates. save data resident evil 4 wii dolphin emulator
%userprofile%\Documents\Dolphin Emulator\Wii\title\00010000\52423445\data\ A: Yes