DVD backup after authoring problem!!!!!!

Hi, im new to DVD burning and wondered if anybody could help me with this problem. Im fairly advanced but now im stcu so here goes.

1) I have converted a divx movie to dvd movie in tmpgenc.

2) I have then authored movie with Tmpgenc dvd author

3)Dvd2one my authored movie then burnt the movie to dvdr-


The movie is fine and plays but i need to know two things?

1) My menu i created with tmpgenc author dissapeared after i dvd20ned the files, why

2) From my movie that is now on dvd, no matter how hard i try i cannot back up the movie as i always get read errors using decrypter. Every single time this happens and i dont know why?

Is there any way of checking my authored files before burning to dvd, obviously i am burning corrupt files to dvd to start with and then when i try to rip the dvd, the decrypter software is picking up on this.

I am using datasafe 4x disks.

Any help would be appreciated,

Cheers boz