Asklemmy

I don't know about your budget, but I'd do it onto HDDs. They're cheap and large. But use two and regularly check them like every other month or so. If one breaks, get a replacement. That's the most simple (if you have an external dock) and cheap solution that you OWN.

Also copy it at least twice onto each in case of corruption. Also use a copier that verifies (fastcopy, teracopy etc)

I use multiple offline HDDs with a policy to keep n copies between them because it's by far the cheapest way to still own the data. It requires regular checks because HDDs are likely to fail after a decade or so and a bunch of HDDs are a pain to manage, so you will need tooling for this. I use git-annex for this purpose but it's not particularly user-friendly.

https://en.wikipedia.org/wiki/M-DISC

Honestly? If it's not that much data just throw an additional copy up on Google Drive.