First year.. I had a laptop.. but then the stuff you do in the 1st year actually not worth backing up

So I had never really archived it..
In 2nd & 3rd year.. My Laptop was gone!!

And had to buy a Desktop and because of the nature of the assignments it was damn important to back it up!! So I used that method of Multi-Session re-writing..
But make sure you buy a Quality DVD-RW Disks because, you are writing in and out all the time there's a good chance it will corrupt.... (it happened to me) and its best that you keep at least 2 backups separately!