hmm i doubt you'll find somewhere for free that will offer you that much space. To be honest i would say your best bet is to get an external hard drive. I would never trust the internet to securely hold all my data as a back up. Ive got a seagate 280 GB external hard drive that sites behind my printer and it only cost me £80. At first i backed everything up from my hard drive and everyweek it updates any new or changed files automatically while im out drinking on a friday nite. Which is handy!