For the immediate milestone, exclude History and Thumbnails from being backed...

chrome/browser/history/thumbnail_database.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/history/thumbnail_database.h"
 
 #include "app/gfx/codec/jpeg_codec.h"
 #include "app/sql/statement.h"
 #include "app/sql/transaction.h"
 #include "base/file_util.h"
+#if defined(OS_MACOSX)
+#include "base/mac_util.h"
+#endif
 #include "base/time.h"
 #include "base/string_util.h"
 #include "chrome/browser/diagnostics/sqlite_diagnostics.h"
 #include "chrome/browser/history/history_publisher.h"
 #include "chrome/browser/history/url_database.h"
 #include "chrome/common/thumbnail_score.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace history {
 
@@ skipping 35 matching lines @@
   // database while we're running, and this will give somewhat improved perf.
   db_.set_exclusive_locking();
 
   if (!db_.Open(db_name))
     return INIT_FAILURE;
 
   // Scope initialization in a transaction so we can't be partially initialized.
   sql::Transaction transaction(&db_);
   transaction.Begin();
 
+#if defined(OS_MACOSX)
+  // Exclude the thumbnails file and its journal from backups.
+  mac_util::SetFileBackupExclusion(db_name, true);
+  FilePath::StringType db_name_string(db_name.value());
+  db_name_string += "-journal";
+  FilePath db_journal_name(db_name_string);
+  mac_util::SetFileBackupExclusion(db_journal_name, true);
+#endif
+
   // Create the tables.
   if (!meta_table_.Init(&db_, kCurrentVersionNumber,
                         kCompatibleVersionNumber) ||
       !InitThumbnailTable() ||
       !InitFavIconsTable(false)) {
     db_.Close();
     return INIT_FAILURE;
   }
   InitFavIconsIndex();
 
@@ skipping 360 matching lines @@
   // Rename the temporary one.
   if (!db_.Execute("ALTER TABLE temp_favicons RENAME TO favicons"))
     return false;
 
   // The renamed table needs the index (the temporary table doesn't have one).
   InitFavIconsIndex();
   return true;
 }
 
 }  // namespace history