they should check filesize (and perhaps there should be a constant to define the threshold(s))
comments about this here: http://tracker.moodle.org/browse/MDL-16382
Committed two helper functions for modules to use and also changed all the callers to use it. This comes with admin settings for thresholds of 'moderate' and 'high' for both file based and db based exports.
Notes here: http://docs.moodle.org/en/Development:Adding_a_Portfolio_Button_to_a_page#expected_time