Author: Zig Tan
MDL-61881 report_backup: Implement null privacy provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8f2e5829ce07a6960840aae98800d822860d10df
http://github.com/moodle/moodle/commit/8f2e5829ce07a6960840aae98800d822860d10df
+ 3.4 en [privacy:metadata,report_backups]