datahoarder
Who are we?
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
We are one. We are legion. And we're trying really hard not to forget.
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No and they're too expensive too.
You're thinking about the premium memory cards, correct? I've seen high capacity cards going for higher prices than even SSDs but I'd consider backing up and replacing media more often instead of dumping that much money into a single medium. Security by volume.
The trouble is that the failures are correlated. As the cards get older, they lose data more. Also even the cheap ones are expensive compared to alternatives. How much data are you talking about? Your best bet is probably backing up to remote storage. Everyone wants what you are asking for, but the only good answer is a tape drive, and those are too expensive to even think about. I use borg backup with this: https://www.hetzner.com/storage/storage-box/
I have 5TB there, very affordable and all encrypted.
I respect and understand the appeal of cloud storage bu i want my files at my home. No special reason, just do not feel the need or want to pay others to keep what is mine.
How much data? Can you keep some hard drives spinning? What is your budget? How will you do off site copies?
At present, I'd risk about 1TB, with the added "risk" of facing a sharp growth during this year. Core files are music, photos, some older films and series that are already hard to find.
I actively burned copies to disks some time back but a succession of events led me to just having multiple copies across several HDDs that I occasionally power up to check. I can afford to spend some cash on HDDs. On paper, getting some MDisks seems more than reasonable but my national market is cutting back hard on DVD/BR disks and even reader/burners. It is reaching a point where it feels it is already being viewed as a "professional" medium. MDisk burners are even harder to source.
I looked up MDiscs and they are pretty stupidly expensive but might be a reasonable bet. You might want to use something like PAR to make a backup, that gives you some redundancy without making extra copies.
From experience I can say leaving HDD's powered down for long periods is asking for trouble. The lubricants in them get sticky and then the drives won't spin up. Ideally you want to keep your HDD's spinning all or most of the time.
I guess you could check ebay for an older generation LTO tape drive. LTO 5 isn't a total relic yet, and it stores 1.5TB on a tape, which would give you a bit of headroom above your 1TB dataset. Tape and optical disc are about the only backup media with any durability.
If your media files are of public interest and not in copyright, you could upload them to archive.org which is free, and other people could access them too.