diff --git a/main.py b/main.py
index a763400..cc77dfe 100644
--- a/main.py
+++ b/main.py
@@ -243,6 +243,19 @@ def cookbook(author_id: str, db: Session = Depends(get_db)):
     return [r.to_app() for r in rows]
 
 
+@app.delete("/cookbook/{author_id}")
+def delete_cookbook(author_id: str, db: Session = Depends(get_db)):
+    """Opt-out del respaldo: borra las copias PRIVADAS de un autor. Lo que
+    publicó a propósito (pública / no listada) se mantiene."""
+    n = (
+        db.query(Recipe)
+        .filter(Recipe.author_id == author_id, Recipe.visibility == "private")
+        .delete()
+    )
+    db.commit()
+    return {"deleted": n}
+
+
 @app.post("/recipes")
 def add_recipe(body: RecipeIn, db: Session = Depends(get_db)):
     items = [i.model_dump() for i in body.items]
diff --git a/test_recipes.py b/test_recipes.py
index 1c39d41..f88db4d 100644
--- a/test_recipes.py
+++ b/test_recipes.py
@@ -47,3 +47,14 @@ def test_receta_anonima_sin_nombre():
                 "items": [], "visibility": "public", "authorId": "a2"})
     got = client.get("/recipes/anon").json()
     assert got["authorName"] is None
+
+
+def test_delete_cookbook_borra_solo_privadas():
+    client.post("/recipes", json={"id": "d_pub", "name": "P", "servings": 1,
+                "items": [], "visibility": "public", "authorId": "del"})
+    client.post("/recipes", json={"id": "d_prv", "name": "Q", "servings": 1,
+                "items": [], "visibility": "private", "authorId": "del"})
+    res = client.request("DELETE", "/cookbook/del").json()
+    assert res["deleted"] == 1
+    ids = {x["id"] for x in client.get("/cookbook/del").json()}
+    assert ids == {"d_pub"}  # la pública se mantiene