The biggest ingredient I see is irrelevant redundancy relative to backups of digital files as, I've found, over the years, very few request a copy of a digital file and I haven't encountered corrupted digital files on my XT HD's.. As for making copies of your art for posterity, I recommend making prints that people can view with their eyes several hundred years from now.
I haven't had a HD die just yet and I suppose I'm due but when that happens I have several backups that, I hope, one will work for bringing up some clients request for a photograph from the past.
My recommendation, careful care of your existing files on existing drives should be a source of recall later, many years/decades from now.
I've got negatives from the 1950's and forward in time, one copy and I haven't been skunked yet.
Here are my current external drives I use for images:
http://www.bhphotovideo.com/c/produc...ential_SE.html
Good luck.
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