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

chrome/browser/history/history_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/history_database.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
-
 #include "app/sql/transaction.h"
 #include "base/file_util.h"
+#if defined(OS_MACOSX)
+#include "base/mac_util.h"
+#endif
 #include "base/histogram.h"
 #include "base/rand_util.h"
 #include "base/string_util.h"
 #include "chrome/browser/diagnostics/sqlite_diagnostics.h"
 
 namespace history {
 
 namespace {
 
 // Current version number. We write databases at the "current" version number,
@@ skipping 58 matching lines @@
 
   if (!db_.Open(history_name))
     return INIT_FAILURE;
 
   // Wrap the rest of init in a tranaction. This will prevent the database from
   // getting corrupted if we crash in the middle of initialization or migration.
   sql::Transaction committer(&db_);
   if (!committer.Begin())
     return INIT_FAILURE;
 
+#if defined(OS_MACOSX)
+  // Exclude the history file and its journal from backups.
+  mac_util::SetFileBackupExclusion(history_name, true);
+  FilePath::StringType history_name_string(history_name.value());
+  history_name_string += "-journal";
+  FilePath history_journal_name(history_name_string);
+  mac_util::SetFileBackupExclusion(history_journal_name, true);
+#endif
+
   // Prime the cache.
   db_.Preload();
 
   // Create the tables and indices.
   // NOTE: If you add something here, also add it to
   //       RecreateAllButStarAndURLTables.
   if (!meta_table_.Init(&db_, kCurrentVersionNumber, kCompatibleVersionNumber))
     return INIT_FAILURE;
   if (!CreateURLTable(false) || !InitVisitTable() ||
       !InitKeywordSearchTermsTable() || !InitDownloadTable() ||
@@ skipping 188 matching lines @@
       "WHERE id IN (SELECT id FROM segment_usage WHERE time_slot > 0);");
 
   // Erase all the full text index files. These will take a while to update and
   // are less important, so we just blow them away. Same with the archived
   // database.
   needs_version_17_migration_ = true;
 }
 #endif
 
 }  // namespace history