* finish task #2262.

module/backup/config.php

@@ -0,0 +1,2 @@
+<?php
+$config->backup->holdDays = 14;

module/backup/control.php

@@ -112,6 +112,17 @@ class backup extends control
             $this->backup->addFileHeader($this->backupPath . $fileName . '.file.zip.php');
         }
 
+        /* Delete expired backup. */
+        $sqlFiles = glob("{$this->backupPath}*.sql.php");
+        if(!empty($sqlFiles))
+        {
+            $time = time();
+            foreach($sqlFiles as $file)
+            {
+                if($time - filemtime($file) > $this->config->backup->holdDays * 24 * 3600) unlink($file);
+            }
+        }
+
         if($reload == 'yes')
         {
             echo js::alert($this->lang->backup->success->backup);
@@ -192,4 +203,22 @@ class backup extends control
 
         die(js::reload('parent'));
     }
+
+    /**
+     * Change hold days. 
+     * 
+     * @access public
+     * @return void
+     */
+    public function change()
+    {
+        if($_POST)
+        {
+            $data = fixer::input('post')->get();
+            $this->loadModel('setting')->setItem('system.backup.holdDays', $data->holdDays);
+            die(js::reload('parent.parent'));
+        }
+
+        $this->display();
+    }
 }

module/backup/lang/en.php

@@ -5,6 +5,8 @@ $lang->backup->history  = 'History';
 $lang->backup->delete   = 'Delete';
 $lang->backup->backup   = 'Backup';
 $lang->backup->restore  = 'Restore';
+$lang->backup->change   = 'Change hold days';
+$lang->backup->changeAB = 'change';
 
 $lang->backup->name  = 'Name';
 $lang->backup->time  = 'Time';
@@ -14,6 +16,7 @@ $lang->backup->size  = 'Size';
 $lang->backup->waitting       = '<span id="backupType"></span> is in progress, please wait...';
 $lang->backup->confirmDelete  = 'Are you sure delete this backup?';
 $lang->backup->confirmRestore = 'Are you sure restore this backup?';
+$lang->backup->holdDays       = 'Keep backup copy of the recent %s days';
 
 $lang->backup->success = new stdclass();
 $lang->backup->success->backup  = 'Success backup!';

module/backup/lang/zh-cn.php

@@ -5,6 +5,8 @@ $lang->backup->history  = '备份历史';
 $lang->backup->delete   = '删除备份';
 $lang->backup->backup   = '备份';
 $lang->backup->restore  = '还原';
+$lang->backup->change   = '修改保留时间';
+$lang->backup->changeAB = '修改';
 
 $lang->backup->name  = '文件名称';
 $lang->backup->time  = '备份时间';
@@ -14,6 +16,7 @@ $lang->backup->size  = '大小';
 $lang->backup->waitting       = '<span id="backupType"></span>正在进行中，请稍候...';
 $lang->backup->confirmDelete  = '是否删除备份？';
 $lang->backup->confirmRestore = '是否还原该备份？';
+$lang->backup->holdDays       = '备份保留最近 %s 天';
 
 $lang->backup->success = new stdclass();
 $lang->backup->success->backup  = '备份成功！';

module/backup/view/change.html.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * The change view file of backup module of ZenTaoPMS.
+ *
+ * @copyright   Copyright 2009-2015 青岛易软天创网络科技有限公司(QingDao Nature Easy Soft Network Technology Co,LTD, www.cnezsoft.com)
+ * @license     ZPL (http://zpl.pub/page/zplv11.html)
+ * @author      Yidong Wang <yidong@cnezsoft.com>
+ * @package     backup
+ * @version     $Id$
+ * @link        http://www.zentao.net
+ */
+?>
+<?php include '../../common/view/header.lite.html.php';?>
+<div id='titlebar'>
+  <div class='heading'>
+    <span class='prefix'><?php echo html::icon($lang->icons['edit']);?></span>
+    <strong><?php echo $lang->backup->change;?></strong>
+  </div>
+</div>
+
+<form class='form-condensed' method='post' target='hiddenwin' style='padding: 30px 5%'>
+  <table class='w-p100'>
+    <tr>
+      <td>
+        <div class='input-group'>
+          <?php echo html::input('holdDays', $config->backup->holdDays, "class='form-control'");?>
+          <strong class='input-group-addon'><?php echo $lang->day;?></strong>
+        </div>
+      </td>
+      <td><?php echo html::submitButton();?></td>
+    </tr>
+  </table>
+</form>
+<?php include '../../common/view/footer.lite.html.php';?>
+

module/backup/view/index.html.php

@@ -57,6 +57,14 @@
       <?php endforeach;?>
     <?php endforeach;?>
     </tbody>
+    <tfoot>
+      <tr>
+        <td colspan='4'>
+        <?php printf($lang->backup->holdDays, $config->backup->holdDays)?>
+        <?php if(common::hasPriv('backup', 'change')) echo html::a(inlink('change'), $lang->backup->changeAB, '', "class='iframe' data-width='300'");?>
+        </td>
+      </tr>
+    </tfoot>
   </table>
 </div>
 <div class="modal fade" id="waitting" tabindex="-1" role="dialog" aria-hidden="true">