Restore from the game's own backup copy
Symptom
You want to go back to the previous save using the .bak file the game keeps.
Steps marked “changes files” delete, rename or overwrite something. Back up the whole save folder first.
Quit the game and Steam. Turn off Steam Cloud for Elden Ring so it doesn't overwrite your local file.changes files
Open
%appdata%\EldenRing\<your Steam ID>. CopyER0000.sl2andER0000.sl2.bakto a safe folder first.Delete
ER0000.sl2, then renameER0000.sl2.baktoER0000.sl2.changes filesLaunch the game. If it fails, put the original files back exactly as they were.changes files
Check: the character slots load.
Another fallback: right-click
ER0000.sl2> Properties > Previous Versions (Windows restore points), if you have them turned on.changes files