The Cool Side of the Pillow

Store for what purpose? Fast and short time backup? Long term archival?

Depends on what you want to do with the file. For small files I want to back up, I just email them to myself and make a copy to my phone (or desktop if it's originally from my phone). By the way, if your files are corrupting easily on memory cards, I wonder if that's because of the file system rather than the quality of the memory card itself. Microsoft got exFAT mandated as the default file system for virtually all SD cards now and it's prone to corruption.

Github code vault is QR codes on 35mm film, right? That seems like one of the best ways

For the love of god 3-2-1 anything you want to keep 3 copies On 2 different media types (disk + disc is a pretty solid way to go) At least 1 offsite

USB drives are pretty trash, fragile, and typically made from the cheapest flash memory possible, SD cards are a little better and give you the benefit of dedicated readers and flush mounting (no USB connector to snap off) but can still suffer bit rot

CD/DVD/BD are nice, they can still degrade over time in storage (I’ve heard timeframes up to a decade) but they don’t degrade faster while powered off (which is a weakness of flash media) and aren’t nearly as susceptible to drops/bumps as an HDD

Don't use flash drives, they're susceptible to the same issue as memory cards, especially when not powered on for a long time.

Check out blu-ray m-discs. They're ceramic discs that are physically etched on burn (you'll need a compatible burner). Once burned, any blu-ray drive can read it. They have theoretical lifespans of over 100 years. If you go this route, I recommend storing a blu-ray drive (or two) with your discs. This is exactly what I do for important documents.

Tape is another great option, however it is more sensitive to environmental factors such as temperature and humidity. I also use this for backups.

Hard drives can have bit rot, especially if not powered for long periods. You can definitely still use them as part of your backup solution, but I'd put them into an array or pool of disks which checks for corruption or sync issues. Unraid, for example, can do this. TrueNAS has options for this as well. It's a rabbit hole to get into them, but if you want to get serious about backups (such as setting up 3-2-1 or even 4-3-2 backups), you'll probably want something in the middle that manages everything. Just keep in mind that RAID (or Unraid's array protection) is not a backup on its own. You can use it as part of the solution, but do not ever rely on RAID to protect your data.

Print it out into a series of QR codes on cards, and then store it in a binder with your old pokemon cards. Make sure to draw a pentagram in smeared ash somewhere so that it's demon proof

Tape Drives last the longest I believe. Always have multiple backups for anything important though.

Almost any kind of modern solid state storage device could potentially last for a few hundred years if properly stored. SSDs, flash cards, USB drives, etc.

That said, the absolute best storage medium for anything you want to keep safe and secure would be physical copies inside a fireproof safe.

Burn to a Blu-ray disc and every eight years copy to a fresh one. Method presumes blank writable Blu-rays will continue to be sold.

Shout the information into a canyon, the information is stored for however long it takes for the echoes to ebb out

I believe CD/DVD is supposed to last for a long time since the information is stored as a physical feature, and it has a lot of redundancy built in

flash and magnetic storage fades and can more easily get corrupted or damaged

Etching the information into glass slides gives you something that will probably outlive the human species