I have lots of tutorial dvds (downloaded) as ISO images, they all are not exactly of 4.7 GB some are even 1 GB. So keeping it safe for at least 4 years with regular usage, what shall i opt for? The total tutorial of various softwares are about more than 200 GB. Should I buy a 250 GB internal hard ( cheap ) and fill in everything or burn them in dvds? I fear if HDD is crashed, then I have to waste another 2 months downloading them again. Please help me with this.