Rooting video here:
http://androidforums.com/a75-all-things-root/502084-working-how-root-micromax-a75-3.html
Thanks to "545himanshu" for this.
how to root micromax a75 superfone lite - YouTube
I did not take any backup before rooting, however maybe others would be able to advise you on this. Btw, what old drivers are you trying to backup ?
Android (2.3.4) is one of the best available today, and i think the hardware and the default configuration of Micromax that makes you sad. Root it and get rid of all that unnecessary crap, your phone will be much faster and smoother and then you will feel that its a value for money.