diff --git a/mod/workshop/form/numerrors/backup/moodle2/backup_workshopform_numerrors_subplugin.class.php b/mod/workshop/form/numerrors/backup/moodle2/backup_workshopform_numerrors_subplugin.class.php
new file mode 100644
index 0000000000000..a355339eb86cd
--- /dev/null
+++ b/mod/workshop/form/numerrors/backup/moodle2/backup_workshopform_numerrors_subplugin.class.php
@@ -0,0 +1,110 @@
+<?php
+
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * @package    workshopform_numerrors
+ * @subpackage backup-moodle2
+ * @copyright  2010 David Mudrak <david@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Provides the information to backup numerrors grading strategy information
+ */
+class backup_workshopform_numerrors_subplugin extends backup_subplugin {
+
+    /**
+     * Returns the assessment form definition to attach to 'workshop' XML element
+     */
+    protected function define_workshop_subplugin_structure() {
+
+        // XML nodes declaration
+        $subplugin = $this->get_subplugin_element(); // virtual optigroup element
+        $subpluginwrapper = new backup_nested_element($this->get_recommended_name());
+        $subpluginmap = new backup_nested_element('workshopform_numerrors_map', array('id'), array(
+            'nonegative', 'grade'));
+        $subplugindimension = new backup_nested_element('workshopform_numerrors_dimension', array('id'), array(
+            'sort', 'description', 'descriptionformat', 'grade0', 'grade1', 'weight'));
+
+        // connect XML elements into the tree
+        $subplugin->add_child($subpluginwrapper);
+        $subpluginwrapper->add_child($subpluginmap);
+        $subpluginwrapper->add_child($subplugindimension);
+
+        // set source to populate the data
+        $subpluginmap->set_source_table('workshopform_numerrors_map', array('workshopid' => backup::VAR_ACTIVITYID));
+        $subplugindimension->set_source_table('workshopform_numerrors', array('workshopid' => backup::VAR_ACTIVITYID));
+
+        // file annotations
+        $subplugindimension->annotate_files('workshopform_numerrors', 'description', 'id');
+
+        return $subplugin;
+    }
+
+    /**
+     * Returns the dimension grades to attach to 'referenceassessment' XML element
+     */
+    protected function define_referenceassessment_subplugin_structure() {
+        return $this->dimension_grades_structure('workshopform_numerrors_referencegrade');
+    }
+
+    /**
+     * Returns the dimension grades to attach to 'exampleassessment' XML element
+     */
+    protected function define_exampleassessment_subplugin_structure() {
+        return $this->dimension_grades_structure('workshopform_numerrors_examplegrade');
+    }
+
+    /**
+     * Returns the dimension grades to attach to 'assessment' XML element
+     */
+    protected function define_assessment_subplugin_structure() {
+        return $this->dimension_grades_structure('workshopform_numerrors_grade');
+    }
+
+    ////////////////////////////////////////////////////////////////////////////
+    // internal private methods
+    ////////////////////////////////////////////////////////////////////////////
+
+    /**
+     * Returns the structure of dimension grades
+     *
+     * @param string forst parameter of {@link backup_nested_element} constructor
+     */
+    private function dimension_grades_structure($elementname) {
+
+        // create XML elements
+        $subplugin = $this->get_subplugin_element(); // virtual optigroup element
+        $subpluginwrapper = new backup_nested_element($this->get_recommended_name());
+        $subplugingrade = new backup_nested_element($elementname, array('id'), array(
+            'dimensionid', 'grade', 'peercomment', 'peercommentformat'));
+
+        // connect XML elements into the tree
+        $subplugin->add_child($subpluginwrapper);
+        $subpluginwrapper->add_child($subplugingrade);
+
+        // set source to populate the data
+        $subplugingrade->set_source_sql(
+            "SELECT id, dimensionid, grade, peercomment, peercommentformat
+               FROM {workshop_grades}
+              WHERE strategy = 'numerrors' AND assessmentid = ?",
+              array(backup::VAR_PARENTID));
+
+        return $subplugin;
+    }
+}