diff --git a/tubearchivist/home/src/download/thumbnails.py b/tubearchivist/home/src/download/thumbnails.py
index 7041ec2..ca498c5 100644
--- a/tubearchivist/home/src/download/thumbnails.py
+++ b/tubearchivist/home/src/download/thumbnails.py
@@ -246,9 +246,10 @@ class ThumbManager(ThumbManagerBase):
 class ValidatorCallback:
     """handle callback validate thumbnails page by page"""
 
-    def __init__(self, source, index_name):
+    def __init__(self, source, index_name, counter=0):
         self.source = source
         self.index_name = index_name
+        self.counter = counter
 
     def run(self):
         """run the task for page"""
@@ -384,9 +385,10 @@ class EmbedCallback:
     MEDIA_DIR = CONFIG["application"]["videos"]
     FORMAT = MP4Cover.FORMAT_JPEG
 
-    def __init__(self, source, index_name):
+    def __init__(self, source, index_name, counter=0):
         self.source = source
         self.index_name = index_name
+        self.counter = counter
 
     def run(self):
         """run embed"""
diff --git a/tubearchivist/home/src/es/backup.py b/tubearchivist/home/src/es/backup.py
index df1a481..3dc1cf5 100644
--- a/tubearchivist/home/src/es/backup.py
+++ b/tubearchivist/home/src/es/backup.py
@@ -18,6 +18,8 @@ from home.src.ta.helper import get_mapping, ignore_filelist
 class ElasticBackup:
     """dump index to nd-json files for later bulk import"""
 
+    INDEX_SPLIT = ["comment"]
+
     def __init__(self, reason=False, task=False):
         self.config = AppConfig().config
         self.cache_dir = self.config["application"]["cache_dir"]
@@ -51,14 +53,18 @@ class ElasticBackup:
 
     def backup_index(self, index_name):
         """export all documents of a single index"""
-        paginate = IndexPaginate(
-            f"ta_{index_name}",
-            data={"query": {"match_all": {}}},
-            keep_source=True,
-            callback=BackupCallback,
-            task=self.task,
-            total=self._get_total(index_name),
-        )
+        paginate_kwargs = {
+            "data": {"query": {"match_all": {}}},
+            "keep_source": True,
+            "callback": BackupCallback,
+            "task": self.task,
+            "total": self._get_total(index_name),
+        }
+
+        if index_name in self.INDEX_SPLIT:
+            paginate_kwargs.update({"size": 200})
+
+        paginate = IndexPaginate(f"ta_{index_name}", **paginate_kwargs)
         _ = paginate.get_results()
 
     @staticmethod
@@ -206,9 +212,10 @@ class ElasticBackup:
 class BackupCallback:
     """handle backup ndjson writer as callback for IndexPaginate"""
 
-    def __init__(self, source, index_name):
+    def __init__(self, source, index_name, counter=0):
         self.source = source
         self.index_name = index_name
+        self.counter = counter
         self.timestamp = datetime.now().strftime("%Y%m%d")
 
     def run(self):
@@ -237,7 +244,8 @@ class BackupCallback:
     def _write_es_json(self, file_content):
         """write nd-json file for es _bulk API to disk"""
         cache_dir = AppConfig().config["application"]["cache_dir"]
-        file_name = f"es_{self.index_name.lstrip('ta_')}-{self.timestamp}.json"
+        index = self.index_name.lstrip("ta_")
+        file_name = f"es_{index}-{self.timestamp}-{self.counter}.json"
         file_path = os.path.join(cache_dir, "backup", file_name)
         with open(file_path, "a+", encoding="utf-8") as f:
             f.write(file_content)
diff --git a/tubearchivist/home/src/es/connect.py b/tubearchivist/home/src/es/connect.py
index 43e2f6e..a7c3ff5 100644
--- a/tubearchivist/home/src/es/connect.py
+++ b/tubearchivist/home/src/es/connect.py
@@ -204,7 +204,9 @@ class IndexPaginate:
                     all_results.append(hit["_source"])
 
             if self.kwargs.get("callback"):
-                self.kwargs.get("callback")(all_hits, self.index_name).run()
+                self.kwargs.get("callback")(
+                    all_hits, self.index_name, counter=counter
+                ).run()
 
             if self.kwargs.get("task"):
                 print(f"{self.index_name}: processing page {counter}")