I posted in another thread, the contacts sync is highly incomplete - it doesn't support multiple email addresses or postal information, that much I found out right away. While interesting to play with right now, it's not ready as a real backup solution unless all you do is store one email address and phone numbers (multiple numbers do work/sync).

@plchan: I had to sit here and manually delete each contact in their webUI over and over and over as well, it was a bit painful on the ol' mouse clicker. yeesh.