Don’t know anything about the other device, however, whatever you decide, try to avoid having all info copy via:
NAS->PC->NAS.
Some ideas I can think of, then you decide:
-
FTP from one to the other via CLI
-
FXP if both support it ( http://community.wd.com/t5/My-Book-Live/GUIDE-Enable-FXP-transfers-between-2-MyBookLives/m-p/535436/highlight/true#M18266)
-
Mount a share and copy via CLI
-
rsynch
And if secure copy is a concern:
- SCP (runs over SSH).