Well these hard drives are NOT indented for long term storage, but for low access but online storage. That way it will be on standby or in low use, but you will have the data and be able to access it.
Turns out that old tech it mostly used for long term storage. As it does not suffer from technology changes over time. Sometimes even analog storage is better than digital, depending on what you want to store.
Everything else will be lost in time, unless you keep if current or do maintenance, but that requires that someone does it hence requires money. And that will only be done as long as it is a viable option in order to save something that need saving, as soon as you do not need it any more, lost to time.
A rosetta stone, or stuff in stone has survived like forever, and a modern version of that is the way to go for long term storage.
The only things I can think of in terms of storage that has survived for some time now, is vinyl (LP) discs, are compact disc. At least the ones that are pressed in a factory. Not the ones you burn at home.