diff --git a/exif_database/__main__.py b/exif_database/__main__.py
index d3cd972..050800c 100644
--- a/exif_database/__main__.py
+++ b/exif_database/__main__.py
@@ -1,4 +1,5 @@
 import hashlib
+import json
 import os
 import subprocess
 import sys
@@ -29,18 +30,36 @@ if __name__ == '__main__':
     database = mongo.exif_database
     collection = database.pictures
 
-    pictures_metadata = []
+    metadata_pictures = []
+
+    # Load saved pictures cache
+    try:
+        with open('exif-database.json', 'r') as f:
+            saved_pictures = json.load(f)
+    except FileNotFoundError:
+        saved_pictures = {}
 
     for file in Path(sys.argv[1]).rglob("*.ARW"):
         filename = os.fsdecode(file)
-        print(filename)
+
+        if filename in saved_pictures:
+            print(f'Skipping {filename}')
+            continue
+
+        print(f'Uploading {filename}')
 
         picture_metadata = _execute_exiftool(filename)
-        pictures_metadata.append(picture_metadata)
+        metadata_pictures.append(picture_metadata)
 
         # Append MongoDB identifier
         picture_metadata['_id'] = hashlib.sha1(filename.lower().encode('utf-8')).hexdigest()
-        picture_metadata['path'] = sys.argv[1]
+        picture_metadata['path'] = filename
+
+        saved_pictures[picture_metadata['path']] = True
 
     # Insert into MongoDB
-    collection.insert_many(pictures_metadata)
+    collection.insert_many(metadata_pictures)
+
+    # Save saved pictures cache
+    with open('exif-database.json', 'w') as f:
+        json.dump(saved_pictures, f)