Backup WD My Book Live to a remote NAS

FTP from one to the other is an option, however, FTP is not a secure protocol.

If security is a concern, it is a bit more complicated but doable. Mid to advance level though.

WD does not support remote backups. However, these devices and most NAS regardless of brand, run some flavor of Unix. MBL runs Debian Lenny. So plenty of options at the OS level.

http://community.wd.com/t5/My-Book-Live/Secure-remote-automatic-backup-1-MBL-to-another/td-p/567763/highlight/true