The Operator software automatically makes backups of your saves whenever you launch a game or download a save. Currently a maximum of 15 saves for each game is stored.
In order to open access them, you need to follow these steps:
Open a terminal window and type:
open ~/Library/Application\ Support/Epilogue/Epilogue\ Operator/vault
You can replace the cores there with your own.
Open explorer.exe, and type in the address bar: