diff --git a/photograb/main.py b/photograb/main.py
index 49eabe9..0481e11 100644
--- a/photograb/main.py
+++ b/photograb/main.py
@@ -27,31 +27,40 @@ def main(opts):
         # TODO: gracefully fail if camera is not writable.
         pass
 
+    # Store the content list before grabbing
+    camera_files = camera.read_content()
+    new_files = {}
     if opts.grab:  # Grab new files from camera
         # TODO: gracefully fail if camera is not readable.
         print_success("Grabbing...")
-        camera_files = camera.read_content()
         for ext, backup in backups.items():
             bkp_files = backup.read_content(exclude_trash=False)
             with_ext = camera_files.filter_by_ext(ext)
-            new_files = with_ext.difference(bkp_files)
-            backup.copy_content(new_files)
+            new_files[ext] = with_ext.difference(bkp_files)
+            backup.copy_content(new_files[ext])
             if ext in imports:
-                imports[ext].copy_content(new_files)
+                imports[ext].copy_content(new_files[ext])
 
     if opts.sync:  # Synchronize deleted files
         print_success("Syncing...")
         imported = find_imported()
         for ext, backup in backups.items():
             with_ext = imported.filter_by_ext(ext)
-            deleted = backup.difference(with_ext)
+            deleted = backup.read_content().difference(with_ext)
+            # Prevent from trashing new (thus not yet imported) files
+            deleted.difference(new_files[ext])
             backup.trash_content(deleted)
             if opts.update_card:
-                deleted = camera.difference(with_ext)
+                # Use content list before grabbing
+                # to avoid deleting new files
+                deleted = camera_files.difference(with_ext)
                 camera.remove_content(deleted)
 
-    if opts.wipe_card:  # Wipe the camera memory
-        pass
+    if opts.wipe_card:  # Remove all files from camera
+        on_card = camera.read_content()
+        for ext in backups:
+            to_delete = on_card.filter_by_ext(ext)
+            camera.remove_content(to_delete)
 
     if opts.clean_trash:  # Clean the bins
         print_success("Cleaning...")
diff --git a/photograb/store.py b/photograb/store.py
index 11dc9f2..154b150 100644
--- a/photograb/store.py
+++ b/photograb/store.py
@@ -4,6 +4,8 @@ import shutil
 import os
 import time
 
+from .utils import print_warning
+
 
 class Content(dict):
 
@@ -100,4 +102,4 @@ class Backup(Store):
         self.trash.move_content(content)
 
     def clean_trash(self):
-        raise NotImplementedError
+        print_warning("Fake cleaning !")
diff --git a/photograb/test/test_store.py b/photograb/test/test_store.py
index 99b0ebe..56ebb2e 100644
--- a/photograb/test/test_store.py
+++ b/photograb/test/test_store.py
@@ -27,6 +27,14 @@ class TestContent(unittest.TestCase):
                 ('test2.jpg', Path("~/test2.jpg")),
                 ('test4.mp4', Path("~/test4.mp4")),
             )))
+        diff = self.second.difference(self.first)
+        self.assertEqual(
+                diff,
+                Content())
+
+    def test_difference_with_empty_returns_all(self):
+        diff = self.first.difference(Content())
+        self.assertEqual(diff, self.first)
 
     def test_filter_by_ext_that_exists(self):
         self.assertEqual(