Backorder vs Expired Auction
These two paths occur at different points in a domain's lifecycle and involve different uncertainty.
Expired auction
An expired auction is a marketplace sale associated with a domain whose registration was not renewed. You bid against other participants under the marketplace's rules. The auction may end without a completed transfer under some circumstances, so read the current terms.
Backorder
A backorder asks a service to attempt to acquire a domain if it becomes available. Multiple interested buyers can lead to an auction. A backorder is an attempt, not a reservation or guarantee.
Which should you use?
Compare timing, likelihood of acquisition, total cost, and the marketplace rules. Both require the same domain diligence: name quality, history, backlinks, trademark screening, renewal fee, and likely buyer demand. See expired auctions and backorders.
Research current domains
Apply these ideas to listings, then verify each source.