Why is it "illegal" to backup my games?

[ssj12]

twesterm said:

Galaki said:

If it's not illegal, then why it is impossible for me to play from backup without going through modding my system? Which is not what I wanted to do.

They want the system as closed as possible because if they didn't, something like the Dreamcast would happen.  You could simply copy a disc and play it, backup or not, so that's what people did. 

The Dreamcast failed because SEGA showed they didnt care about their systems and didnt give userbases any decent amount of time between systems/system upgrade components. If SEGA put even one more year between hardware releases SEGA most likely would still be making consoles today.