As explained on Philips.com:
Because of its sensitive surface, it was necessary to package the CD
in such a way that it would be fully protected against damage. The
package also had to provide space for a booklet, and of course
automatic assembly was another important requirement.
Product development teams at PolyGram in Germany and the ...
These days, HDD; with SSD coming a strong second, or even first but for price - though that could change in a few years.
I can only really back this up anecdotally, though Backblaze have some large data sets of which HDDs are surviving best. They provide a report & links to the data every quarter. Most recent is One Billion Drive Hours and Counting: Q1 ...
I've been unable to locate any particularly poignant adjective used by The Economist. The most regrettable statement that I could locate was:
Yet ever since he started writing the soaring tunes which have became his trademark, he has been dogged by accusations of plagiarism.
The "Wagnerian" adjective was used by The Independent:
There's a reservoir of ...
Did a search on the web and found this product which is the kind of product that I mentioned in my comment above:
But the same search also returned this one which is probably exactly what you're looking for:
Now I'm not recommending these specific products and suppliers (I don't know them and I don't even know if they're available in your region) but by ...