optical media "raid array"

Well, once i saw that blu rays are now cheaper than hard drives by around $0.02 per gig, this made me want to do something like raid with them.

I do not want to hook up multiple blu ray drives to be raided together, i want something that will take data and make a parity file or something that i can burn separately to other dvds. i would likely be zipping all the files together, encrypting them, then splitting them into seperate 10-20 gig files, likely 7z files.

Does such a program exist?

Some reasons why this might be better are

cheaper per gig
no risks associated with the data being connected to an outlet
no risks (significantly less) from software hardware failure associated with always being connected
the media is separated, so you can distribute it to different locations and not have to have it in 1 spot

So is this idea good or bad, and is it possible? what are possible problems. i am currently using ubuntu, so is it possible some snazzy stuff already exists and its just a matter of typing it in?

Edit:

nvm, its called Parchive