Unhappy [Q] CWM restore not restoring user data?

Firstly, I apologize if this been answered before or this is a stupid question.
Basically, I was a stuck in a boot loop, so I made a back up in cwm first then re-flashed the rom and restored in cwm and when I rebooted it, it was the same thing, meaning it was just a new rom with no user data or anything. Why is that? I read in forums that cwm does back up user data. Thanks in advance