diff --git a/backend/.env b/backend/.env
index ddc953c..5c1abf4 100644
--- a/backend/.env
+++ b/backend/.env
@@ -1,2 +1,3 @@
 SUPABASE_URL=https://tnpnlkosqqudoadfylss.supabase.co
-SUPABASE_SERVICE_ROLE_KEY=sb_publishable_UqXeuY5gOjvGpoNO1ciZYw_g7nO2M1Q
+SUPABASE_SERVICE_ROLE_KEY=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZSIsInJlZiI6InRucG5sa29zcXF1ZG9hZGZ5bHNzIiwicm9sZSI6InNlcnZpY2Vfcm9sZSIsImlhdCI6MTc3MTAyNTQwOCwiZXhwIjoyMDg2NjAxNDA4fQ.v1xblErJBBv8p001vvTCUBfjP8ZqskfXNETB_yJOgvc
+SUPABASE_BUCKET=archives
diff --git a/backend/__pycache__/api_routes.cpython-311.pyc b/backend/__pycache__/api_routes.cpython-311.pyc
index c6c5b4f..6251856 100644
Binary files a/backend/__pycache__/api_routes.cpython-311.pyc and b/backend/__pycache__/api_routes.cpython-311.pyc differ
diff --git a/backend/__pycache__/db_queries.cpython-311.pyc b/backend/__pycache__/db_queries.cpython-311.pyc
index 690ec4a..a64d1c4 100644
Binary files a/backend/__pycache__/db_queries.cpython-311.pyc and b/backend/__pycache__/db_queries.cpython-311.pyc differ
diff --git a/backend/api_routes.py b/backend/api_routes.py
index 5a75fd7..8cc83cb 100644
--- a/backend/api_routes.py
+++ b/backend/api_routes.py
@@ -34,6 +34,7 @@ from db_queries import (
     list_user_history,
     search_rag_chunks,
     update_audio_post,
+    upload_storage_object,
     upsert_archive_metadata,
     upsert_archive_rights,
 )
@@ -49,6 +50,7 @@ ALLOWED_MEDIA_EXTENSIONS = {"mp4", "mov", "mkv", "webm", "m4a", "mp3", "wav", "o
 WHISPER_MODEL = os.getenv("WHISPER_MODEL", "base")
 WHISPER_DEVICE = os.getenv("WHISPER_DEVICE", "cpu")
 WHISPER_COMPUTE_TYPE = os.getenv("WHISPER_COMPUTE_TYPE", "int8")
+ARCHIVE_BUCKET = os.getenv("SUPABASE_BUCKET", os.getenv("SUPABASE_ARCHIVE_BUCKET", "archives"))
 
 _whisper_model: WhisperModel | None = None
 
@@ -207,6 +209,7 @@ def api_upload_post():
     post_uuid = str(uuid.uuid4())
     safe_name = secure_filename(media.filename)
     storage_prefix = f"archive/{user_id}/{post_uuid}"
+    storage_object_path = f"{user_id}/{post_uuid}/original/{safe_name}"
     saved_path = UPLOAD_DIR / f"{post_uuid}_{safe_name}"
     media.save(saved_path)
 
@@ -226,12 +229,20 @@ def api_upload_post():
 
         post_id = int(created_post["post_id"])
         media_sha = _sha256(saved_path)
+        with saved_path.open("rb") as media_file:
+            upload_storage_object(
+                bucket=ARCHIVE_BUCKET,
+                object_path=storage_object_path,
+                content=media_file.read(),
+                content_type=media.mimetype or "application/octet-stream",
+                upsert=False,
+            )
 
         add_archive_file(
             post_id,
             {
                 "role": "original_audio",
-                "path": str(saved_path).replace("\\", "/"),
+                "path": f"{ARCHIVE_BUCKET}/{storage_object_path}",
                 "content_type": media.mimetype,
                 "size_bytes": saved_path.stat().st_size,
                 "sha256": media_sha,
@@ -300,7 +311,7 @@ def api_upload_post():
                 "post_id": post_id,
                 "visibility": visibility,
                 "status": "ready",
-                "audio_path": str(saved_path).replace("\\", "/"),
+                "audio_path": f"{ARCHIVE_BUCKET}/{storage_object_path}",
                 "transcript_text": transcript_text,
                 "prompt": prompt_text,
                 "rag_chunk_count": len(rag_rows),
diff --git a/backend/db_queries.py b/backend/db_queries.py
index 204db1c..0aee46a 100644
--- a/backend/db_queries.py
+++ b/backend/db_queries.py
@@ -36,6 +36,26 @@ def _paginate(page: int, limit: int) -> tuple[int, int]:
     return start, end
 
 
+def upload_storage_object(
+    bucket: str,
+    object_path: str,
+    content: bytes,
+    content_type: str = "application/octet-stream",
+    upsert: bool = False,
+) -> Dict[str, Any]:
+    """
+    Upload bytes to Supabase Storage and return upload response data.
+    """
+    return (
+        supabase.storage.from_(bucket)
+        .upload(
+            object_path,
+            content,
+            {"content-type": content_type, "upsert": str(upsert).lower()},
+        )
+    )
+
+
 # ==================== Users ====================
 
 def create_user(payload: Dict[str, Any]) -> Dict[str, Any]:
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