According to your firs post you have DVD on your HD. You did not say what size it is.
If you backed up commercial DVD, most likely it is made for double layer DVD.
Nero will do DVD9=(double layer DVD). Use Nero Recode to do it.
First name the folder where your sub folder VIDEO_TS is (Most likely name of your movie).
Create other sub folder AUDIO_TS in there, this one will be empty (no files inside).
Open NERO Recode and locate your Movie folder. Nero will start working.
If you want to use single layer DVD, you will have to compress your original, like I said before.