Originally Posted by Stefan Daystrom

FWIW, such transfers are often not simple. It's not a matter of pushing a button or running a script. Many partners transfers between themselves using physical media of some sort (tape, disc, etc) through some sort of physical delivery system. Takes people working that day at both ends to do it, and their schedule may not allow for it to be done on a different day if the day it normally happens is a holiday in a given week.

Furthermore, because it's physical media, sometimes it gets corrupted. In that case, add another week!