DLO revert back process after upgrade

Hi

I am planing to do a DLO upgrade which is the first part of the BE 2010 R3 to 2012 upgrade. So i am going from an integrated DLO within BE2010 R3 to DLO 7.0, and later 7.5. In regard to that, i wish to know how i can successfully revert back the process in case it is needed due to some issues i might experience. Would appriciate if someone could throw some light on this. Thanks.