If you place a backorder on a name, they will just send it to TDNam anyway, with your bid at $10 and with 10 days of showing a bid on your name. If anyone outbids you, they get the name and you get credit, rather than a refund. If you don't place the backorder, it will go to the same auction without a bid. Hopefully no one will notice it. You place your bid in the last few minutes, or on the last day. You either win it, or don't, but if you don't, you keep your money.
All in all, backorders with Godaddy are a waste of time and do more harm than good. Wait for the auction on TDNam and bid, and if it never makes it to auction there, you just have to make a readl bid to the owner of the name.