Author: Zig Tan
MDL-33886 backup: Add backup filename length < 255 char validation
http://git.moodle.org/gw?p=moodle.git;a=commit;h=85ba9528c91e199f51e8e7991dc71f8f8824caa4
http://github.com/moodle/moodle/commit/85ba9528c91e199f51e8e7991dc71f8f8824caa4
+ 3.5 en [errorfilenametoolong,core_backup]