How to disable Backspace Button in the Keyboard

[Sujith]

Whenever the user presses backspace key in the keyboard the browser goes to
the previous page, which crashes our site when the user tries to save its
contents once again or he loses data which have been typed.

I think its remedy is to disable backspace button by JavaScript, but how
should I do it ?
If anybody know this code snippet please let me to know

I remember somebody has posted this question, but I cannot find its solution
in archives

Thanks in advance

Have a nice day
Sujith