hello, I have an old HDD backup that I would like to archive, its 60GB. I thought I would back it up to Bluray 100GB disc. Is this a good idea, or is it prone to fail? Do people usually do this kind of thing? Is it better to burn a disc image to it or backup it up like I usually backup to an external HDD? If I choose to encrypt the disc image, should i expect trouble in the future or is it a reliable?