How to dupe before maintenance

When a GM is about to close server u need to log 2 accounts again this time
trade ur stuff to 2nd client but once its finished trading do not move with the
char u just traded all your stuff from. now with the other char that has the items
you wish to dupe move around/go through a portal this will save data and when maint occurs
the first char will rollback with hes equips and the 2nd will have the equips because it was
backed up and data was saved.