Why can't I go back with backspace in Safari 8?

In every single browser on every single OS (with a keyboard) I've used, backspace would go (history.)back to the previous visited page in that tab. For some reason this doesn't work for me on my new MacBook in Safari. Is this normal behaviour (seriously, why?) or can I somehow set it? It does work in Chrome and Firefox.

I'm new to Mac and still need to get used to the multi-finger swipe on the trackpad, but I am aware that is another way to do this. Just want my old trusted backspace behaviour back. ;)