For security you would normally transfer the file(s) over ssh with sftp or scp instead of ftp. If you wanted to backup all the files in domain_name and transfer them to a remote box with ip 192.168.1.103 and login as user "joe" on that box, you would run:
# tar -cvf backup.tar /mnt/md7/www/vhosts/domain_name/ && scp backup.tar joe@192.168.1.103:/home/joe/
At which point you would be prompted for joe's password and then the transfer of your backup archive, backup.tar, would start to joe's home directory. Once the transfer is done, you can remove the archive on the local machine, unless you want to save it:
# rm backup.tar
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