Thanks for the replies guys, but still I seem to be missing something here.
Firstly, we aren't flying radials anymore while enroute, which means the VOR is not being in use. Also, I understand that it's said to be used as a backup, but how is it backup exactly?
It will tell you where your position is (what radial you are on) from a certain VOR, and then how does that help you exactly?
Still seem to be a little confused.