Author: Frederic Massart
MDL-33812 Backup: Respect of backup_auto_keep
http://git.moodle.org/gw?p=moodle.git;a=commit;h=905185dca45a953f420fd1410176992b2baa440f
http://github.com/moodle/moodle/commit/905185dca45a953f420fd1410176992b2baa440f
+ 2.3 en [backup_shortnamehelp,core_admin]