Update
I tried to restore a course, and I got the error below, where can I enable grade history?
Attempting to recover grades when grade history is disabled.
line 950 of /lib/gradelib.php: call to debugging()
line 1347 of /lib/enrollib.php: call to grade_recover_history_grades()
line 524 of /enrol/manual/lib.php: call to enrol_plugin->enrol_user()
line 1900 of /backup/moodle2/restore_stepslib.php: call to enrol_manual_plugin->restore_user_enrolment()
line 137 of /backup/util/plan/restore_structure_step.class.php: call to restore_enrolments_structure_step->process_enrolment()
line 103 of /backup/util/helper/restore_structure_parser_processor.class.php: call to restore_structure_step->process()
line 151 of /backup/util/xml/parser/processors/grouped_parser_processor.class.php: call to restore_structure_parser_processor->dispatch_chunk()
line 91 of /backup/util/helper/restore_structure_parser_processor.class.php: call to grouped_parser_processor->postprocess_chunk()
line 148 of /backup/util/xml/parser/processors/simplified_parser_processor.class.php: call to restore_structure_parser_processor->postprocess_chunk()
line 92 of /backup/util/xml/parser/processors/progressive_parser_processor.class.php: call to simplified_parser_processor->process_chunk()
line 190 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser_processor->receive_chunk()
line 278 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser->publish()
line ? of unknownfile: call to progressive_parser->end_tag()
line 179 of /backup/util/xml/parser/progressive_parser.class.php: call to xml_parse()
line 158 of /backup/util/xml/parser/progressive_parser.class.php: call to progressive_parser->parse()
line 110 of /backup/util/plan/restore_structure_step.class.php: call to progressive_parser->process()
line 181 of /backup/util/plan/base_task.class.php: call to restore_structure_step->execute()
line 177 of /backup/util/plan/base_plan.class.php: call to base_task->execute()
line 167 of /backup/util/plan/restore_plan.class.php: call to base_plan->execute()
line 333 of /backup/controller/restore_controller.class.php: call to restore_plan->execute()
line 184 of /backup/util/ui/restore_ui.class.php: call to restore_controller->execute_plan()
line 107 of /backup/restore.php: call to restore_ui->execute()