I think some routers say you can do that through their programs but they often promise more than they can deliver.
The below will work if you have two mybooklives but not if you have an external hard drive. Cost isn’t that much different between an external harddrive and a mbl anyway is it? You can put them in separate houses too in case there is a fire.
bittorent sync. http://labs.bittorrent.com/experiments/sync.html and http://forum.bittorrent.com/topic/17214-help-installing-bt-sync-on-wd-mybook-live/
It’s not the same thing as the torrent downloads just an fyi in case you were worried it isn’t private. Note, I haven’t used the program myself yet so don’t know how well it works but looking at their forums, I think it’s promising.
