Don't think you're out of luck if the property you want to buy already has an accepted offer.  Did you know that it's not uncommon for buyers to fall out of escrow?  By writing a backup offer, you place yourself in line to be considered should the initial purchase not come to fruition.  Check out this incredible scenario where 3rd in line ultimately got the house!
https://youtu.be/o0Ca-lPc3xQ