"RAID" one disk to a partition on another?
First of all, sorry if this is the wrong board, couldn't see one specifically for backups/storage.
On my home PC, I have for far too long now been relying on a single HDD to store all my important data, with no backup. Yes, yes, I know, rookie mistake!
Well, the reason I've never gotten around to sorting it out is that financially, the purchase of a couple of HDDs for a RAID just isn't going to happen any time soon, something more urgent always comes along.
What I'd like to do (if possible) is set up a RAID style backup system, whereby my existing data drive is backed up in it's entirety to a partition on a second, much larger disk, in as close to real time as possible. The reason I want to do this is that I do have the budget to purchase a single, high capacity disk and my existing disk is close to full. I'd like to do some housework on the existing disk so that only the really important stuff is left on there and backed up, then the remaining space on the larger disk can be used for less important things.
Unless I'm mistaken (and I'd love to be!), RAID will only work with whole disks, not partitions.
So my question to you all is, how would you go about doing this? I'm thinking some kind of software RAID setup would be ideal, if such a thing exists.
I'm running Windows 7, may move to Windows 8 soon.
Any help will be much appreciated! :)