Well, one more reply, since you hit the nail. That's precisely why I was asking if anybody did try to go forward with this idea. I'm thinking about how to distribute files into BluRay with as little pain as possible. My plan:

1 disc will be MAIN and it will include:
/.bitcoin/chainstate/ directory. It's possible to add new files into disc, so I don't have to use new disc every time.
+ bitcoin.conf (not really needed)

2, 3, 4, 5, 6 ++ discs will include only files from /.bitcoin/blocks/ directory. Which seems to be nice to handle. Only blk*.dat and rev*.dat files. One or two pairs of such files are created every day and never modified later (ignoring deep rollbacks). I have 100G size discs, so it's not too many discs even for some years ahead.

files in main /.bitcoin/ directory: peers.dat, mempool.dat, banlist.dat, fee_estimates.dat, debug.log, onion private keys, wallets --> will be excluded (I think this should be fine)

then I have /.bitcoin/indexes/txindex/ .. which is probably not needed and can be rebuild? I don't know.

That should be all. If you can ACK/NACK my plan, let me know. I do have Blu-Ray drive, so that part is okay with me :-)

I'm not going to continue this threat then. This is the last post. CD and DVD lasts much less than BluRay discs. Point is to shield from EMP attacks. I'm aware that I won't have latest data, but loosing 1 month seems still much better than loosing full chain. Main point is to have some kind of disaster recovery. Armageddon recovery.

Has anyone proceeded with this idea? I was thinking about the same. Not as a business, rather as archiving the chain for a long time. I picked blu-ray, because it's long lasting and EMP resistant medium.