Hi, like I wrote earlier, you can totally remove backup functionality by setting that config var to zero, but maybe better to keep it at 1 .
Sitecake is originally designed for small static websites, and by it's usability it's made to be easily used by everyone (even non-IT people that are not so familiar with concept of content editing and CMS). As I can figure, you are developer, and I'm sure that you experienced lots of times that your client manage to screw things up somehow. Well, this is why this backup comes in hand .
Around 2 months ago we started to work on Sitecake v3 and it's coming with plugin API, so everyone will be able to create new functionality. If you stick around with sitecake there's a good chance you will be able to easily write your own backup plugin .