We are happy to present one of the expected features, Steam Cloud backups. With this feature, you will be able to back up some files in your RetroArch directory to your Steam Cloud.
RetroArch/saves // saves folder
retroarch.cfg // main configuration file
RetroArch/states *.state // every state file
RetroArch/config *.opt // dlc options
*lpl // history entries
In order for the Steam Cloud sync to work correctly, default directories shouldn’t be changed to other locations.