by John Szkudlapski.
Derek
Actually it happens on every backup I have tried, even some as small as 10mb
https://tracker.moodle.org/browse/MDL-34388
Looks exactly like what I am experienging, however I dont have a clue how to install the fix
My 2.4 install 2.4.1+ (20130208) built 5 days ago, so not sure if this fix is included in the base install