To find your savegame you need to know these two locations.



You can copy & paste that address in your Windows Explorer's address bar for easy access!




The Steam Cloud savegame backup can be found here:
https://psteamproxy.yuanyoumao.com/account/remotestorageapp/?appid=1285190



If you like the game making an automatic backup whenever you launch Borderlands 4, you can use a simple script for that which can be found here:

https://www.nexusmods.com/borderlands4/mods/99



It is very easy to use and free. Making savegame backups of Borderlands 4 easier than ever!