diff --git a/scripts/menu.pl b/scripts/menu.pl
index a58af4a..8c1b36f 100644
--- a/scripts/menu.pl
+++ b/scripts/menu.pl
@@ -43,9 +43,19 @@ my %handlers = (
 
         # Download ran experiments from mars
         my @dirs = Mars::find_remote_subdirs($remote_builds_dir);
+
+        my @existing = Util::find_subdirs($local_archive_dir);
+        my @new_dirs;
+        foreach (@dirs) {
+            my $dir = $_ =~ s/:/-/gr;
+            unless ( grep { /$dir/ } @existing ) {
+                push @new_dirs, $_;
+            }
+        }
+
         my @selected_dirs =
           TUI::select_from_list( "Select Experiments to Download from Mars",
-            1, @dirs );
+            1, @new_dirs );
         die "No experiment selected" unless @selected_dirs;
         Mars::download_dir( "$remote_builds_dir/$_",
             "$local_archive_dir/" . $_ =~ s/:/-/gr )