Do you know if there will be any loss???. I don´t have dvd burner and I got some projects that won't fit in one CD. If that kind of backup is not good. Do you have other idea???.
Buy a DVD burner for $50 from newegg.com and save them in their virgin state.
(I personally don't want to save my precious files in ANY compression scheme, so-called lossless or not. Raw won't come back to bite you in the butt later....)