Just go to android \data\com.bandainamcoent.dblegends_ww\files
Backup only file inside that folder not other folders u won't need to Google or Facebook among those file one or few act as save file linking to ur game Id
Similarly if there an update just rename com.bandainamcoent.dblegends_ww to com.bandainamcoent.dblegends_ww1 go to playstore uninstall the game reinstall playstore version and rename file back u can play legit till mod update once mod there do same rename uninstall original and install mod and happy modding