DVD's data discs can have safedisc used on them too.
BenQ is a 1 sheep writer meaning it can only backup safedisc 2 old anything over that doesnt work.
One Sheep Writer - SD2OLD(safedisc 2) = Yes
Two Sheep Writer - SD251 (safedisc 2.51) = No
Safedisc Writer - SD290 (safedisc 2.90) = No
Three Sheep Writer SHEEP3 = No