Hello I am backing up my Avatar Collectors Edition. I want to be able to play it on the PlayStation 3 which is 2.0 Stereo and on a Home Cinema with 5.1.

There are 2 audio options on the BluRay which are DTS 5.1 TrueHD and Dolby Surround! Do I need to backup both of these or just the Dolby Surround.

EDIT: On the disc menu when I hover over DTS 5.1 TrueHD it says:

For systems that cannot reproduce the 5.1 format, a 2-channel mix was created, which will play on a system with only two speaks or a home theatre system featuring pro-logic decoding.

(Does this mean the TrueHD track contains both 2 channel and 5.1?