I have for the the last 16 years been taking digital images
And working on the development for the last 9 years of what we now have
in place of what we older folk called a Jukebox.
I was in Japan when the CD revolution took off and even then everyone know it was only going to be a small life span that the CD was going to have.
But my point is if you want to make you digital software as safe as you can the most effective way of doing it at a cost the average person can afford is by making sets of DVDs .
By sets I mean you make your first DVD say its got 500 images on it
then you make two copy's of that DVD that gives you a set of three
the reason for three is simple after working with this media for the last 20+ years I know from my own experience even the best discs will fail at some time so you need to have at least two copy;s
This is the most effective way of doing it
You will get boy geeks saying use hard drives or even solid state drives but the same applies you need to have backups to because the drives will fail at some time to
Hope this is of some help