how to setup ubuntu as a backup server for my windows computer

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http://askubuntu.com – i took my old computer (amd 5600+, 2gb ram, 880gt, 250gb sata etc etc) and decided to jump and try ubuntu for the first time. i have very VERY little knowledge (red hat when i was younger) with linux in general. my main desktop is windows 7 and my plan is to use the ubuntu computer as a file server sort of speak. I want to be able to setup back up schedules from my windows pc to the ubuntu pc(plan on leaving this on 24/7 to double as a seedbox) how do i go on to doing this? thanks in advance. having fun trying out a new os (HowTos)