Author: Zig Tan
MDL-61881 report_backup: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=554b8789d6774a89a86f38c37437e4ed091deaa3
http://github.com/moodle/moodle/commit/554b8789d6774a89a86f38c37437e4ed091deaa3
+ 3.5 en [privacy:metadata,report_backups]