I would heavily suggest not doing this. HDDs are significantly more reliable than flash storage when it comes to long-term, power-off data retention. Period. There’s a relatively little-known fact about SSDs and flash storage where they aren’t actually rated to sit around with data on them for all that long. The voltages stored inside of them degrade and the data is slowly lost over time if they aren’t powered on. The enterprise SSDs that I work on are rated for 3 months - as in, set it on a shelf for three months, and after that, if you don’t power it on, it isn’t guaranteed that all of your data will still be there. And this is talking about ultra-redundant, enterprise SAS SSDs. MicroSDs don’t have any of that redundancy. (And yes - this implies that setting a bunch of important flash drives in a safe for ten years is not a great idea. That is true! It’s unlikely that you will experience data loss, but it’s more likely than with an HDD)

Just back them up in multiple places. I’d suggest Backblaze for offsite storage; I use it to back up my important data.

A plain old samba share works just fine, I’ve got a few running at home.

Out of curiosity, what’s wrong with medium? (Serious question)

The Crucial option is good because of more upgrade ability in the future. But - here’s another idea, that’s right around $100 but will be even smaller & more portable: Drive like this one: https://a.co/d/2dnQ1w1 With an adapter like this one: https://a.co/d/eiYVTvu

That said, I think your crucial SSD+enclosure would work just fine. I’ve got one of the m.2 adapters above and it’s a handy little thing so I know that works, too.

We need more info about the drive. Is it new? If so, absolutely RMA it. Just isn’t worth the headache even if the self test reports fine. If not new, how many hours? Reads? Writes? Any failures reported by SMART? Et cetera.

The more info, the better. I work in SSD failure analysis/firmware development.

The pins are called “DuPont connectors” - you’d want to chop the LED-side and use a 3 pin female DuPont instead of a 2 pin. If this is something you think you’ll do more than once, I’d buy a crimper on Amazon or wherever (they’re ~$25 last time I checked). But, you could also pull the two wires out of the connector and keep the crimps on them, and then just stick them into the DuPont plastic shell which would avoid needing a new pair of crimpers. To remove them, there’s usually a little tiny plastic tab on one side for each contact that you can pry up with a little tiny screwdriver.