diff --git a/vcsserver/git.py b/vcsserver/git.py
--- a/vcsserver/git.py
+++ b/vcsserver/git.py
@@ -447,6 +447,14 @@ class GitRemote(object):
             return remote_refs
 
     @reraise_safe_exceptions
+    def sync_push(self, wire, url, refs=None):
+        if self.check_url(url, wire):
+            repo = self._factory.repo(wire)
+            self.run_git_command(
+                wire, ['push', url, '--mirror'], fail_on_stderr=False)
+
+
+    @reraise_safe_exceptions
     def get_remote_refs(self, wire, url):
         repo = Repo(url)
         return repo.get_refs()
diff --git a/vcsserver/hg.py b/vcsserver/hg.py
--- a/vcsserver/hg.py
+++ b/vcsserver/hg.py
@@ -561,6 +561,15 @@ class HgRemote(object):
             repo, remote, heads=commit_ids, force=None).cgresult
 
     @reraise_safe_exceptions
+    def sync_push(self, wire, url):
+        if self.check_url(url, wire['config']):
+            repo = self._factory.repo(wire)
+            bookmarks = dict(repo._bookmarks).keys()
+            remote = peer(repo, {}, url)
+            return exchange.push(
+                repo, remote, newbranch=True, bookmarks=bookmarks).cgresult
+
+    @reraise_safe_exceptions
     def revision(self, wire, rev):
         repo = self._factory.repo(wire)
         ctx = repo[rev]