diff --git a/backup/controller/backup_controller.class.php b/backup/controller/backup_controller.class.php
index 1bab62be627..d6d7bd1d6a1 100644
--- a/backup/controller/backup_controller.class.php
+++ b/backup/controller/backup_controller.class.php
@@ -293,6 +293,14 @@ class backup_controller extends backup implements loggable {
         // Basic/initial prevention against time/memory limits
         set_time_limit(1 * 60 * 60); // 1 hour for 1 course initially granted
         raise_memory_limit(MEMORY_EXTRA);
+        // If this is not a course backup, inform the plan we are not
+        // including all the activities for sure. This will affect any
+        // task/step executed conditionally to stop including information
+        // for section and activity backup. MDL-28180.
+        if ($this->get_type() !== backup::TYPE_1COURSE) {
+            $this->log('notifying plan about excluded activities by type', backup::LOG_DEBUG);
+            $this->plan->set_excluding_activities();
+        }
         return $this->plan->execute();
     }
 
diff --git a/backup/controller/restore_controller.class.php b/backup/controller/restore_controller.class.php
index 50ec1027d02..680e6e9d95f 100644
--- a/backup/controller/restore_controller.class.php
+++ b/backup/controller/restore_controller.class.php
@@ -299,6 +299,14 @@ class restore_controller extends backup implements loggable {
         // Basic/initial prevention against time/memory limits
         set_time_limit(1 * 60 * 60); // 1 hour for 1 course initially granted
         raise_memory_limit(MEMORY_EXTRA);
+        // If this is not a course restore, inform the plan we are not
+        // including all the activities for sure. This will affect any
+        // task/step executed conditionally to stop processing information
+        // for section and activity restore. MDL-28180.
+        if ($this->get_type() !== backup::TYPE_1COURSE) {
+            $this->log('notifying plan about excluded activities by type', backup::LOG_DEBUG);
+            $this->plan->set_excluding_activities();
+        }
         return $this->plan->execute();
     }
 
diff --git a/backup/moodle2/restore_stepslib.php b/backup/moodle2/restore_stepslib.php
index f83b7c3752c..14d130afa3b 100644
--- a/backup/moodle2/restore_stepslib.php
+++ b/backup/moodle2/restore_stepslib.php
@@ -1805,15 +1805,20 @@ class restore_course_completion_structure_step extends restore_structure_step {
 
         $data->course = $this->get_courseid();
 
-        $params = array(
-            'course' => $data->course,
-            'criteriatype' => $data->criteriatype,
-            'method' => $data->method,
-            'value' => $data->value,
-        );
-        $DB->insert_record('course_completion_aggr_methd', $params);
+        // Only create the course_completion_aggr_methd records if
+        // the target course has not them defined. MDL-28180
+        if (!$DB->record_exists('course_completion_aggr_methd', array(
+                    'course' => $data->course,
+                    'criteriatype' => $data->criteriatype))) {
+            $params = array(
+                'course' => $data->course,
+                'criteriatype' => $data->criteriatype,
+                'method' => $data->method,
+                'value' => $data->value,
+            );
+            $DB->insert_record('course_completion_aggr_methd', $params);
+        }
     }
-
 }
 
 
diff --git a/backup/util/plan/backup_plan.class.php b/backup/util/plan/backup_plan.class.php
index f21385cc5f4..bf217fd9c10 100644
--- a/backup/util/plan/backup_plan.class.php
+++ b/backup/util/plan/backup_plan.class.php
@@ -44,6 +44,7 @@ class backup_plan extends base_plan implements loggable {
         }
         $this->controller = $controller;
         $this->basepath   = $CFG->tempdir . '/backup/' . $controller->get_backupid();
+        $this->excludingdactivities = false;
         parent::__construct('backup_plan');
     }
 
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index e540801aa49..a8a8f512f91 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -6951,6 +6951,34 @@ FROM
     // Moodle v2.2.0 release upgrade line
     // Put any upgrade step following this
 
+    if ($oldversion < 2011120500.02) {
+
+        upgrade_set_timeout(60*20); // This may take a while
+        // MDL-28180. Some missing restrictions in certain backup & restore operations
+        // were causing incorrect duplicates in the course_completion_aggr_methd table.
+        // This upgrade step takes rid of them.
+        $sql = 'SELECT course, criteriatype, MIN(id) AS minid
+                  FROM {course_completion_aggr_methd}
+              GROUP BY course, criteriatype
+                HAVING COUNT(*) > 1';
+        $duprs = $DB->get_recordset_sql($sql);
+        foreach ($duprs as $duprec) {
+            // We need to handle NULLs in criteriatype diferently
+            if (is_null($duprec->criteriatype)) {
+                $where = 'course = ? AND criteriatype IS NULL AND id > ?';
+                $params = array($duprec->course, $duprec->minid);
+            } else {
+                $where = 'course = ? AND criteriatype = ? AND id > ?';
+                $params = array($duprec->course, $duprec->criteriatype, $duprec->minid);
+            }
+            $DB->delete_records_select('course_completion_aggr_methd', $where, $params);
+        }
+        $duprs->close();
+
+        // Main savepoint reached
+        upgrade_main_savepoint(true, 2011120500.02);
+    }
+
     return true;
 }
 
diff --git a/version.php b/version.php
index fcc0f57e4b7..86d0ad6aa9e 100644
--- a/version.php
+++ b/version.php
@@ -30,7 +30,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 
-$version  = 2011120500.01;              // 20111205      = branching date YYYYMMDD - do not modify!
+$version  = 2011120500.02;              // 20111205      = branching date YYYYMMDD - do not modify!
                                         //         RR    = release increments - 00 in DEV branches
                                         //           .XX = incremental changes