Friend,
looks like you´re trying to back up the Avi file? If you try to just put it on a DVD, it will not play in a DVD player...
If you want to convert it to a DVD format, I sugest you use "DVD Santa", I think it´s free and it wil convert your avi file directly to .VOB (DVD files to be recorded in a DVD disk). It will manage to adjust the quality to fit into a 4.7 DVD disk.
Cheers,
Fredalme