diff --git a/boards/management/commands/sync_with_server.py b/boards/management/commands/sync_with_server.py
--- a/boards/management/commands/sync_with_server.py
+++ b/boards/management/commands/sync_with_server.py
@@ -5,7 +5,7 @@ import httplib2
 from django.core.management import BaseCommand
 
 from boards.models import GlobalId
-from boards.models.post.sync import SyncManager
+from boards.models.post.sync import SyncManager, TAG_ID, TAG_VERSION
 
 __author__ = 'neko259'
 
@@ -64,11 +64,16 @@ class Command(BaseCommand):
 
                 models = root.findall('models')[0]
                 for model in models:
+                    tag_id = model.find(TAG_ID)
                     global_id, exists = GlobalId.from_xml_element(model)
-                    if not exists:
-                        print(global_id)
+                    tag_version = model.find(TAG_VERSION)
+                    if tag_version is not None:
+                        version = int(tag_version.text) or 1
+                    else:
+                        version = 1
+                    if not exists or global_id.post.version < version:
                         ids_to_sync.append(global_id)
-                print()
+                print('Starting sync...')
 
                 if len(ids_to_sync) > 0:
                     limit = options.get('split_query', len(ids_to_sync))
diff --git a/boards/models/post/sync.py b/boards/models/post/sync.py
--- a/boards/models/post/sync.py
+++ b/boards/models/post/sync.py
@@ -230,6 +230,7 @@ class SyncManager:
                         title=title, text=text, pub_time=pub_time,
                         opening_post=opening_post, tags=tags,
                         global_id=global_id, files=files, tripcode=tripcode)
+                print('Parsed post {}'.format(global_id))
         else:
             raise SyncException(EXCEPTION_NODE.format(tag_status.text))
 
@@ -243,8 +244,11 @@ class SyncManager:
         models = et.SubElement(response, TAG_MODELS)
 
         for post in Post.objects.prefetch_related('global_id').all():
-            tag_id = et.SubElement(models, TAG_ID)
+            tag_model = et.SubElement(models, TAG_MODEL)
+            tag_id = et.SubElement(tag_model, TAG_ID)
             post.global_id.to_xml_element(tag_id)
+            tag_version = et.SubElement(tag_model, TAG_VERSION)
+            tag_version.text = post.version
 
         return et.tostring(response, ENCODING_UNICODE)
 
diff --git a/boards/tests/test_keys.py b/boards/tests/test_keys.py
--- a/boards/tests/test_keys.py
+++ b/boards/tests/test_keys.py
@@ -71,6 +71,7 @@ class KeyTest(TestCase):
                         '<text>[post]%s[/post]</text>'
                         '<thread><id key="%s" local-id="%d" type="%s" /></thread>'
                         '<pub-time>%s</pub-time>'
+                        '<version>%s</version>'
                         '</content>' % (
                             key.public_key,
                             reply_post.id,
@@ -80,6 +81,7 @@ class KeyTest(TestCase):
                             post.id,
                             key.key_type,
                             str(reply_post.get_pub_time_str()),
+                            post.version,
                         ) in response,
                         'Wrong XML generated for the GET response.')
 
diff --git a/boards/tests/test_sync.py b/boards/tests/test_sync.py
--- a/boards/tests/test_sync.py
+++ b/boards/tests/test_sync.py
@@ -43,6 +43,7 @@ class SyncTest(TestCase):
             '<text>%s</text>'
             '<tags><tag>%s</tag></tags>'
             '<pub-time>%s</pub-time>'
+            '<version>%s</version>'
             '</content>' % (
                 post.global_id.key,
                 post.global_id.local_id,
@@ -51,6 +52,7 @@ class SyncTest(TestCase):
                 post.get_sync_text(),
                 post.get_thread().get_tags().first().name,
                 post.get_pub_time_str(),
+                post.version,
             ) in response,
             'Wrong response generated for the GET request.')
 
@@ -90,6 +92,7 @@ class SyncTest(TestCase):
             '<text>%s</text>'
             '<tags><tag>%s</tag></tags>'
             '<pub-time>%s</pub-time>'
+            '<version>%s</version>'
             '</content>' % (
                 post.global_id.key,
                 post.global_id.local_id,
@@ -98,5 +101,6 @@ class SyncTest(TestCase):
                 post.get_sync_text(),
                 post.get_thread().get_tags().first().name,
                 post.get_pub_time_str(),
+                post.version,
             ) in response,
             'Wrong response generated for the GET request.')