If it expired on Feb1 - It should be on TDNAM now or within the next day or so. No need to backorder, but be patient. Dont place a bid on the domain name until a few minutes before the end of auction. If you place a bid on it now, you will "highlight" the domain name for other domainers and you will pay more for it then you should have to! Also, if its kind of obscure, you may want to let it lapse on the auction block.
When a domain goes through auction and isnt picked up, TDNAM relists it as a Buy It Now option for $5 + 1 Year Renewal. So you save 10 dollars, this is as long as no one bids. Dont forget though, original owners still have redemption options on domain names while their at TDNAM. Just cause you bid and win, doesnt mean you will get it. (although, Ive only had that happen once!)
Justin