/usr/local/directadmin/dataskq d800
You can best run from 'admin level' a full backup of all users.
Then "grab" the backups with ncftp or something from the 'old' machine.
Import backups and wait or run (after pressing "start import")to see the process liveCode:/usr/local/directadmin/dataskq d800
There's no reason why you can't backup individual users from the admin reseller backups.
Jeff