Take anycubic's approach to implement power outage support. SD card wearing can be prevented by disabling it via POWER_OUTAGE_TEST flag.

Marlin/src/module/configuration_store.h

@@ -27,6 +27,15 @@
   #include "../HAL/shared/eeprom_api.h"
 #endif
 
+#ifdef POWER_OUTAGE_TEST
+
+static bool RestartFlag = false;
+void OutageSave();
+void OutageRead();
+extern float last_position[4];
+extern long last_sd_position[1];
+#endif
+
 class MarlinSettings {
   public:
     static uint16_t datasize();