diff --git a/src/auto_archiver/core/media.py b/src/auto_archiver/core/media.py
index 9f15bdc..772a5a8 100644
--- a/src/auto_archiver/core/media.py
+++ b/src/auto_archiver/core/media.py
@@ -41,6 +41,9 @@ class Media:
                         if isinstance(prop_media, Media):
                             s.store(prop_media, url)
 
+    def is_stored(self) -> bool:
+        return len(self.urls) > 0
+
     def set(self, key: str, value: Any) -> Media:
         self.properties[key] = value
         return self
diff --git a/src/auto_archiver/core/metadata.py b/src/auto_archiver/core/metadata.py
index 09791bf..d2e89d4 100644
--- a/src/auto_archiver/core/metadata.py
+++ b/src/auto_archiver/core/metadata.py
@@ -15,14 +15,12 @@ from .context import ArchivingContext
 @dataclass
 class Metadata:
     status: str = "no archiver"
-    _processed_at: datetime = field(default_factory=datetime.datetime.utcnow)
     metadata: Dict[str, Any] = field(default_factory=dict)
     media: List[Media] = field(default_factory=list)
     rearchivable: bool = True  # defaults to true, archivers can overwrite
 
-    # properties below are excluded from JSON representation
-    tmp_keys: Set[str] = field(default_factory=set, repr=False, metadata=config(exclude=True))
-    # tmp_metadata: Dict[str, Any] = field(default_factory=dict, repr=False, metadata=config(exclude=True)) # contains internal properties not to be leaked when .to_json/repr/str is called
+    def __post_init__(self):
+        self.set("_processed_at", datetime.datetime.utcnow())
 
     def merge(self: Metadata, right: Metadata, overwrite_left=True) -> Metadata:
         """
@@ -33,7 +31,6 @@ class Metadata:
             if right.status and len(right.status):
                 self.status = right.status
             self.rearchivable |= right.rearchivable
-            self.tmp_keys |= right.tmp_keys
             for k, v in right.metadata.items():
                 assert k not in self.metadata or type(v) == type(self.get(k))
                 if type(v) not in [dict, list, set] or k not in self.metadata:
@@ -52,10 +49,8 @@ class Metadata:
         for media in self.media:
             media.store(override_storages=storages)
 
-    def set(self, key: str, val: Any, is_tmp=False) -> Metadata:
-        # if not self.metadata: self.metadata = {}
+    def set(self, key: str, val: Any) -> Metadata:
         self.metadata[key] = val
-        if is_tmp: self.tmp_keys.add(key)
         return self
 
     def get(self, key: str, default: Any = None, create_if_missing=False) -> Union[Metadata, str]:
@@ -73,7 +68,7 @@ class Metadata:
         return "success" in self.status
 
     def is_empty(self) -> bool:
-        return not self.is_success() and len(self.media) == 0 and len(self.get_clean_metadata()) <= 2  # url, processed_at
+        return not self.is_success() and len(self.media) == 0 and len(self.metadata) <= 2  # url, processed_at
 
     @property  # getter .netloc
     def netloc(self) -> str:
@@ -142,11 +137,5 @@ class Metadata:
         _default = self.media[0] if len(self.media) else None
         return self.get_media_by_id("_final_media", _default)
 
-    def get_clean_metadata(self) -> Metadata:
-        return dict(
-            {k: v for k, v in self.metadata.items() if k not in self.tmp_keys},
-            **{"processed_at": self._processed_at}
-        )
-
     def __str__(self) -> str:
         return self.__repr__()
diff --git a/src/auto_archiver/enrichers/__init__.py b/src/auto_archiver/enrichers/__init__.py
index fe9cc68..d33b49d 100644
--- a/src/auto_archiver/enrichers/__init__.py
+++ b/src/auto_archiver/enrichers/__init__.py
@@ -3,4 +3,5 @@ from .screenshot_enricher import ScreenshotEnricher
 from .wayback_enricher import WaybackArchiverEnricher
 from .hash_enricher import HashEnricher
 from .thumbnail_enricher import ThumbnailEnricher
-from .wacz_enricher import WaczEnricher
\ No newline at end of file
+from .wacz_enricher import WaczEnricher
+from .whisper_enricher import WhisperEnricher
\ No newline at end of file
diff --git a/src/auto_archiver/formatters/html_formatter.py b/src/auto_archiver/formatters/html_formatter.py
index 80722d3..f30156a 100644
--- a/src/auto_archiver/formatters/html_formatter.py
+++ b/src/auto_archiver/formatters/html_formatter.py
@@ -40,7 +40,7 @@ class HtmlFormatter(Formatter):
             url=url,
             title=item.get_title(),
             media=item.media,
-            metadata=item.get_clean_metadata(),
+            metadata=item.metadata,
             version=__version__
         )
         html_path = os.path.join(ArchivingContext.get_tmp_dir(), f"formatted{str(uuid.uuid4())}.html")
diff --git a/src/auto_archiver/storages/storage.py b/src/auto_archiver/storages/storage.py
index add7242..ce99042 100644
--- a/src/auto_archiver/storages/storage.py
+++ b/src/auto_archiver/storages/storage.py
@@ -42,10 +42,12 @@ class Storage(Step):
         return Step.init(name, config, Storage)
 
     def store(self, media: Media, url: str) -> None:
+        if media.is_stored(): 
+            logger.debug(f"{self.key} already stored, skipping")
+            return
         self.set_key(media, url)
         self.upload(media)
         media.add_url(self.get_cdn_url(media))
-        media.
 
     @abstractmethod
     def get_cdn_url(self, media: Media) -> str: pass