Apple has something called "time machine".
How much data are we talking?
Just 70GB.
Only thing big enough to back up a whole hard drive these days is another hard drive. If you're selective with your backup (I mean, you don't need to back up your OS or apps) you can put it on an optical drive, like a CDRW, or a big flash card. Think about it, a 1TB drive absolutely dwarfs a writeable DVD. It would take well over a hundred to back it up, and probably 80% of your time.
I've been through all kinds of exercises in the last 30 years, including a stack of floppies that would stun an ox, funky tape formats, and recovering the contents of a drive by replacing the circuit board on one that'd died.
Capacities seesawed back and forth between storage and backup for a while, but storage surpassed backup permanently long ago. Drives are orders of magnitude more reliable than they were years ago, and I don't generate much that's valuable enough to waste the time backing it up, so I don't, just save some stuff to 8G flash cards. Those blow my mind.
^^^I picked up a 1TB external drive from Best Buy for under $100. I use the back-up routine included with most all versions of Windows. It works well, and you've already paid for it. Do a bit of reading on the different methods used for back-ups... full, incremental, differential.... not complex at all, it's just a matter of what fits your requirements best.