Most of those ideas are not feasible with a very low budget you want because eventually rot will get to the hard drive and thus making the contents unreadable. So – depending on what you want to preserve – it’s either writable media or printed out in acid-free paper or in microdot negative film, and of those methods, only print media – written, typed, from a copier, or with a laser printer – might as well be cheap.

And considering news headlines in the US right now, where certain sections of science are being suppressed, while others are promoted mainly for profit.