diff --git a/homeassistant/components/backup/util.py b/homeassistant/components/backup/util.py
index c4d69789aac1cc..0cedc07443a84e 100644
--- a/homeassistant/components/backup/util.py
+++ b/homeassistant/components/backup/util.py
@@ -61,7 +61,7 @@ def read_backup(backup_path: Path) -> AgentBackup:
             backup_id=cast(str, data["slug"]),
             database_included=database_included,
             date=cast(str, data["date"]),
-            extra_metadata=cast(dict[str, bool | str], data.get("metadata", {})),
+            extra_metadata=cast(dict[str, bool | str], data.get("extra", {})),
             folders=folders,
             homeassistant_included=homeassistant_included,
             homeassistant_version=homeassistant_version,
diff --git a/tests/components/backup/test_util.py b/tests/components/backup/test_util.py
new file mode 100644
index 00000000000000..888029f2e35428
--- /dev/null
+++ b/tests/components/backup/test_util.py
@@ -0,0 +1,88 @@
+"""Tests for the Backup integration's utility functions."""
+
+from __future__ import annotations
+
+from unittest.mock import Mock, patch
+
+import pytest
+
+from homeassistant.components.backup import AddonInfo, AgentBackup, Folder
+from homeassistant.components.backup.util import read_backup
+
+
+@pytest.mark.parametrize(
+    ("backup_json_content", "expected_backup"),
+    [
+        (
+            b'{"compressed":true,"date":"2024-12-02T07:23:58.261875-05:00","homeassistant":'
+            b'{"exclude_database":true,"version":"2024.12.0.dev0"},"name":"test",'
+            b'"protected":true,"slug":"455645fe","type":"partial","version":2}',
+            AgentBackup(
+                addons=[],
+                backup_id="455645fe",
+                date="2024-12-02T07:23:58.261875-05:00",
+                database_included=False,
+                extra_metadata={},
+                folders=[],
+                homeassistant_included=True,
+                homeassistant_version="2024.12.0.dev0",
+                name="test",
+                protected=True,
+                size=1234,
+            ),
+        ),
+        (
+            b'{"slug":"d4b8fdc6","version":2,"name":"Core 2025.1.0.dev0",'
+            b'"date":"2024-12-20T11:27:51.119062+00:00","type":"partial",'
+            b'"supervisor_version":"2024.12.1.dev1803",'
+            b'"extra":{"instance_id":"6b453733d2d74d2a9ae432ff2fbaaa64",'
+            b'"with_automatic_settings":false},"homeassistant":'
+            b'{"version":"2025.1.0.dev202412200230","exclude_database":false,"size":0.0},'
+            b'"compressed":true,"protected":true,"repositories":['
+            b'"https://github.com/home-assistant/hassio-addons-development","local",'
+            b'"https://github.com/esphome/home-assistant-addon","core",'
+            b'"https://github.com/music-assistant/home-assistant-addon",'
+            b'"https://github.com/hassio-addons/repository"],"crypto":"aes128",'
+            b'"folders":["share","media"],"addons":[{"slug":"core_configurator",'
+            b'"name":"File editor","version":"5.5.0","size":0.0},'
+            b'{"slug":"ae6e943c_remote_api","name":"Remote API proxy",'
+            b'"version":"1.3.0","size":0.0}],"docker":{"registries":{}}}',
+            AgentBackup(
+                addons=[
+                    AddonInfo(
+                        name="File editor",
+                        slug="core_configurator",
+                        version="5.5.0",
+                    ),
+                    AddonInfo(
+                        name="Remote API proxy",
+                        slug="ae6e943c_remote_api",
+                        version="1.3.0",
+                    ),
+                ],
+                backup_id="d4b8fdc6",
+                date="2024-12-20T11:27:51.119062+00:00",
+                database_included=True,
+                extra_metadata={
+                    "instance_id": "6b453733d2d74d2a9ae432ff2fbaaa64",
+                    "with_automatic_settings": False,
+                },
+                folders=[Folder.SHARE, Folder.MEDIA],
+                homeassistant_included=True,
+                homeassistant_version="2025.1.0.dev202412200230",
+                name="Core 2025.1.0.dev0",
+                protected=True,
+                size=1234,
+            ),
+        ),
+    ],
+)
+def test_read_backup(backup_json_content: bytes, expected_backup: AgentBackup) -> None:
+    """Test reading a backup."""
+    mock_path = Mock()
+    mock_path.stat.return_value.st_size = 1234
+
+    with patch("homeassistant.components.backup.util.tarfile.open") as mock_open_tar:
+        mock_open_tar.return_value.__enter__.return_value.extractfile().read.return_value = backup_json_content
+        backup = read_backup(mock_path)
+        assert backup == expected_backup