diff --git a/homeassistant/components/aws_s3/backup.py b/homeassistant/components/aws_s3/backup.py
index 784e267edab..95b9ae671b4 100644
--- a/homeassistant/components/aws_s3/backup.py
+++ b/homeassistant/components/aws_s3/backup.py
@@ -14,6 +14,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -132,6 +133,7 @@ class S3BackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/homeassistant/components/azure_storage/backup.py b/homeassistant/components/azure_storage/backup.py
index 54fd069a11f..5a684bfcc77 100644
--- a/homeassistant/components/azure_storage/backup.py
+++ b/homeassistant/components/azure_storage/backup.py
@@ -16,6 +16,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -129,6 +130,7 @@ class AzureStorageBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup."""
diff --git a/homeassistant/components/backblaze_b2/backup.py b/homeassistant/components/backblaze_b2/backup.py
index 9e795434c25..ec92a41a5dc 100644
--- a/homeassistant/components/backblaze_b2/backup.py
+++ b/homeassistant/components/backblaze_b2/backup.py
@@ -17,6 +17,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -230,6 +231,7 @@ class BackblazeBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup to Backblaze B2.
diff --git a/homeassistant/components/backup/__init__.py b/homeassistant/components/backup/__init__.py
index f3289d6e744..6ed4f1ac2d3 100644
--- a/homeassistant/components/backup/__init__.py
+++ b/homeassistant/components/backup/__init__.py
@@ -17,6 +17,7 @@ from .agent import (
     BackupAgentError,
     BackupAgentPlatformProtocol,
     LocalBackupAgent,
+    OnProgressCallback,
 )
 from .config import BackupConfig, CreateBackupParametersDict
 from .const import DATA_MANAGER, DOMAIN
@@ -41,6 +42,7 @@ from .manager import (
     RestoreBackupEvent,
     RestoreBackupStage,
     RestoreBackupState,
+    UploadBackupEvent,
     WrittenBackup,
 )
 from .models import AddonInfo, AgentBackup, BackupNotFound, Folder
@@ -72,9 +74,11 @@ __all__ = [
     "LocalBackupAgent",
     "ManagerBackup",
     "NewBackup",
+    "OnProgressCallback",
     "RestoreBackupEvent",
     "RestoreBackupStage",
     "RestoreBackupState",
+    "UploadBackupEvent",
     "WrittenBackup",
     "async_get_manager",
     "suggested_filename",
diff --git a/homeassistant/components/backup/agent.py b/homeassistant/components/backup/agent.py
index 8093ac88338..afb4cbf1d18 100644
--- a/homeassistant/components/backup/agent.py
+++ b/homeassistant/components/backup/agent.py
@@ -14,6 +14,13 @@ from homeassistant.core import HomeAssistant, callback
 from .models import AgentBackup, BackupAgentError
 
 
+class OnProgressCallback(Protocol):
+    """Protocol for on_progress callback."""
+
+    def __call__(self, *, bytes_uploaded: int, **kwargs: Any) -> None:
+        """Report upload progress."""
+
+
 class BackupAgentUnreachableError(BackupAgentError):
     """Raised when the agent can't reach its API."""
 
@@ -53,12 +60,14 @@ class BackupAgent(abc.ABC):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
 
         :param open_stream: A function returning an async iterator that yields bytes.
         :param backup: Metadata about the backup that should be uploaded.
+        :param on_progress: A callback to report the number of uploaded bytes.
         """
 
     @abc.abstractmethod
diff --git a/homeassistant/components/backup/backup.py b/homeassistant/components/backup/backup.py
index de2cfecb1a5..3396c7e103f 100644
--- a/homeassistant/components/backup/backup.py
+++ b/homeassistant/components/backup/backup.py
@@ -11,7 +11,7 @@ from typing import Any
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.hassio import is_hassio
 
-from .agent import BackupAgent, LocalBackupAgent
+from .agent import BackupAgent, LocalBackupAgent, OnProgressCallback
 from .const import DOMAIN, LOGGER
 from .models import AgentBackup, BackupNotFound
 from .util import read_backup, suggested_filename
@@ -73,6 +73,7 @@ class CoreLocalBackupAgent(LocalBackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup."""
diff --git a/homeassistant/components/backup/manager.py b/homeassistant/components/backup/manager.py
index 909225f5bde..fbd73a31923 100644
--- a/homeassistant/components/backup/manager.py
+++ b/homeassistant/components/backup/manager.py
@@ -252,6 +252,15 @@ class BlockedEvent(ManagerStateEvent):
     manager_state: BackupManagerState = BackupManagerState.BLOCKED
 
 
+@dataclass(frozen=True, kw_only=True, slots=True)
+class UploadBackupEvent(ManagerStateEvent):
+    """Backup agent upload progress event."""
+
+    agent_id: str
+    uploaded_bytes: int
+    total_bytes: int
+
+
 class BackupPlatformProtocol(Protocol):
     """Define the format that backup platforms can have."""
 
@@ -579,9 +588,24 @@ class BackupManager:
                 _backup = replace(
                     backup, protected=should_encrypt, size=streamer.size()
                 )
-            await self.backup_agents[agent_id].async_upload_backup(
+            agent = self.backup_agents[agent_id]
+
+            @callback
+            def on_upload_progress(*, bytes_uploaded: int, **kwargs: Any) -> None:
+                """Handle upload progress."""
+                self.async_on_backup_event(
+                    UploadBackupEvent(
+                        manager_state=self.state,
+                        agent_id=agent_id,
+                        uploaded_bytes=bytes_uploaded,
+                        total_bytes=_backup.size,
+                    )
+                )
+
+            await agent.async_upload_backup(
                 open_stream=open_stream_func,
                 backup=_backup,
+                on_progress=on_upload_progress,
             )
             if streamer:
                 await streamer.wait()
@@ -1374,9 +1398,10 @@ class BackupManager:
         """Forward event to subscribers."""
         if (current_state := self.state) != (new_state := event.manager_state):
             LOGGER.debug("Backup state: %s -> %s", current_state, new_state)
-        self.last_event = event
-        if not isinstance(event, (BlockedEvent, IdleEvent)):
-            self.last_action_event = event
+        if not isinstance(event, UploadBackupEvent):
+            self.last_event = event
+            if not isinstance(event, (BlockedEvent, IdleEvent)):
+                self.last_action_event = event
         for subscription in self._backup_event_subscriptions:
             subscription(event)
 
diff --git a/homeassistant/components/cloud/backup.py b/homeassistant/components/cloud/backup.py
index bca65a68abd..180c14ef111 100644
--- a/homeassistant/components/cloud/backup.py
+++ b/homeassistant/components/cloud/backup.py
@@ -18,6 +18,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.aiohttp_client import ChunkAsyncStreamIterator
@@ -106,6 +107,7 @@ class CloudBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/homeassistant/components/cloudflare_r2/backup.py b/homeassistant/components/cloudflare_r2/backup.py
index cef9294182e..4fc8199a4b3 100644
--- a/homeassistant/components/cloudflare_r2/backup.py
+++ b/homeassistant/components/cloudflare_r2/backup.py
@@ -14,6 +14,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -129,6 +130,7 @@ class R2BackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/homeassistant/components/google_drive/backup.py b/homeassistant/components/google_drive/backup.py
index bc306fe61d7..e6967d95eaf 100644
--- a/homeassistant/components/google_drive/backup.py
+++ b/homeassistant/components/google_drive/backup.py
@@ -13,6 +13,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.exceptions import HomeAssistantError
@@ -75,6 +76,7 @@ class GoogleDriveBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/homeassistant/components/hassio/backup.py b/homeassistant/components/hassio/backup.py
index 1e9a14be1f2..aeafe7d4d96 100644
--- a/homeassistant/components/hassio/backup.py
+++ b/homeassistant/components/hassio/backup.py
@@ -44,6 +44,7 @@ from homeassistant.components.backup import (
     IncorrectPasswordError,
     ManagerBackup,
     NewBackup,
+    OnProgressCallback,
     RestoreBackupEvent,
     RestoreBackupStage,
     RestoreBackupState,
@@ -183,6 +184,7 @@ class SupervisorBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/homeassistant/components/idrive_e2/backup.py b/homeassistant/components/idrive_e2/backup.py
index 4df337fa27b..2fcdcf73ecc 100644
--- a/homeassistant/components/idrive_e2/backup.py
+++ b/homeassistant/components/idrive_e2/backup.py
@@ -15,6 +15,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -127,6 +128,7 @@ class IDriveE2BackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/homeassistant/components/kitchen_sink/backup.py b/homeassistant/components/kitchen_sink/backup.py
index 46b204845ad..1ff9cc5e05d 100644
--- a/homeassistant/components/kitchen_sink/backup.py
+++ b/homeassistant/components/kitchen_sink/backup.py
@@ -13,6 +13,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupNotFound,
     Folder,
+    OnProgressCallback,
 )
 from homeassistant.core import HomeAssistant, callback
 
@@ -91,6 +92,7 @@ class KitchenSinkBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup."""
diff --git a/homeassistant/components/onedrive/backup.py b/homeassistant/components/onedrive/backup.py
index a76d6df820a..5dd7038f211 100644
--- a/homeassistant/components/onedrive/backup.py
+++ b/homeassistant/components/onedrive/backup.py
@@ -22,6 +22,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -145,6 +146,7 @@ class OneDriveBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup."""
diff --git a/homeassistant/components/onedrive_for_business/backup.py b/homeassistant/components/onedrive_for_business/backup.py
index 52ce8af8941..bec7dfd8c3e 100644
--- a/homeassistant/components/onedrive_for_business/backup.py
+++ b/homeassistant/components/onedrive_for_business/backup.py
@@ -22,6 +22,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -145,6 +146,7 @@ class OneDriveBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup."""
diff --git a/homeassistant/components/sftp_storage/backup.py b/homeassistant/components/sftp_storage/backup.py
index 4859f2d2f2a..2367d022a44 100644
--- a/homeassistant/components/sftp_storage/backup.py
+++ b/homeassistant/components/sftp_storage/backup.py
@@ -12,6 +12,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
 )
 from homeassistant.core import HomeAssistant, callback
 
@@ -85,6 +86,7 @@ class SFTPBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup."""
diff --git a/homeassistant/components/synology_dsm/backup.py b/homeassistant/components/synology_dsm/backup.py
index b3279db1cac..3933a3f2fc2 100644
--- a/homeassistant/components/synology_dsm/backup.py
+++ b/homeassistant/components/synology_dsm/backup.py
@@ -15,6 +15,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -155,6 +156,7 @@ class SynologyDSMBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/homeassistant/components/webdav/backup.py b/homeassistant/components/webdav/backup.py
index 5b27e7be29b..6f856d5de5e 100644
--- a/homeassistant/components/webdav/backup.py
+++ b/homeassistant/components/webdav/backup.py
@@ -17,6 +17,7 @@ from homeassistant.components.backup import (
     BackupAgent,
     BackupAgentError,
     BackupNotFound,
+    OnProgressCallback,
     suggested_filename,
 )
 from homeassistant.core import HomeAssistant, callback
@@ -140,6 +141,7 @@ class WebDavBackupAgent(BackupAgent):
         *,
         open_stream: Callable[[], Coroutine[Any, Any, AsyncIterator[bytes]]],
         backup: AgentBackup,
+        on_progress: OnProgressCallback,
         **kwargs: Any,
     ) -> None:
         """Upload a backup.
diff --git a/tests/components/backup/common.py b/tests/components/backup/common.py
index d9533d2764d..55f15f628d7 100644
--- a/tests/components/backup/common.py
+++ b/tests/components/backup/common.py
@@ -173,6 +173,7 @@ async def setup_backup_integration(
                     side_effect=RuntimeError("Local agent does not open stream")
                 ),
                 backup=backup,
+                on_progress=lambda *, on_progress, **_: None,
             )
         local_agent._loaded_backups = True
 
diff --git a/tests/components/backup/test_manager.py b/tests/components/backup/test_manager.py
index 73cb98d7fd3..b8b69df749e 100644
--- a/tests/components/backup/test_manager.py
+++ b/tests/components/backup/test_manager.py
@@ -3709,3 +3709,77 @@ async def test_manager_not_blocked_after_restore(
         "next_automatic_backup_additional": False,
         "state": "idle",
     }
+
+
+async def test_upload_progress_event(
+    hass: HomeAssistant,
+    hass_ws_client: WebSocketGenerator,
+    generate_backup_id: MagicMock,
+) -> None:
+    """Test that upload progress events are fired when an agent reports progress."""
+    agent_ids = [LOCAL_AGENT_ID, "test.remote"]
+    mock_agents = await setup_backup_integration(hass, remote_agents=["test.remote"])
+
+    remote_agent = mock_agents["test.remote"]
+    original_side_effect = remote_agent.async_upload_backup.side_effect
+
+    async def upload_with_progress(**kwargs: Any) -> None:
+        """Upload and report progress."""
+        on_progress = kwargs["on_progress"]
+        on_progress(bytes_uploaded=500)
+        on_progress(bytes_uploaded=1000)
+        await original_side_effect(**kwargs)
+
+    remote_agent.async_upload_backup.side_effect = upload_with_progress
+
+    ws_client = await hass_ws_client(hass)
+
+    await ws_client.send_json_auto_id({"type": "backup/subscribe_events"})
+
+    result = await ws_client.receive_json()
+    assert result["event"] == {"manager_state": BackupManagerState.IDLE}
+
+    result = await ws_client.receive_json()
+    assert result["success"] is True
+
+    with patch("pathlib.Path.open", mock_open(read_data=b"test")):
+        await ws_client.send_json_auto_id(
+            {"type": "backup/generate", "agent_ids": agent_ids}
+        )
+        result = await ws_client.receive_json()
+        assert result["event"]["manager_state"] == BackupManagerState.CREATE_BACKUP
+
+        result = await ws_client.receive_json()
+        assert result["success"] is True
+
+        await hass.async_block_till_done()
+
+    # Consume intermediate stage events (home_assistant, upload_to_agents)
+    result = await ws_client.receive_json()
+    assert result["event"]["stage"] == CreateBackupStage.HOME_ASSISTANT
+
+    result = await ws_client.receive_json()
+    assert result["event"]["stage"] == CreateBackupStage.UPLOAD_TO_AGENTS
+
+    # Upload progress events for the remote agent
+    result = await ws_client.receive_json()
+    assert result["event"] == {
+        "manager_state": BackupManagerState.CREATE_BACKUP,
+        "agent_id": "test.remote",
+        "uploaded_bytes": 500,
+        "total_bytes": ANY,
+    }
+
+    result = await ws_client.receive_json()
+    assert result["event"] == {
+        "manager_state": BackupManagerState.CREATE_BACKUP,
+        "agent_id": "test.remote",
+        "uploaded_bytes": 1000,
+        "total_bytes": ANY,
+    }
+
+    result = await ws_client.receive_json()
+    assert result["event"]["state"] == CreateBackupState.COMPLETED
+
+    result = await ws_client.receive_json()
+    assert result["event"] == {"manager_state": BackupManagerState.IDLE}