Author: Zig Tan
MDL-61881 report_backup: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=da6c6664414365f7e3662f117857c307162d615e
http://github.com/moodle/moodle/commit/da6c6664414365f7e3662f117857c307162d615e
+ 3.3 en [privacy:metadata,report_backups]