Or you could just copy the JPEG files to multiple devices, using... files, without any specific app. You could use any old software that can copy files from one place to another, like SyncThing, which will happily sit in the background and copy your photos to whatever devices you currently use. If SyncThing stops getting updated, switch to something else. Or copy it by hand again.
Images are files. You do not need to be a computer scientist. If you want them to last, make copies.
Let me just preempt it ahead of time:
> "But what if everything I know and love burns to the ground?"
Consider the following: if all of your computers/phones/tablets/NASes/etc. are destroyed simultaneously, you might have bigger concerns to worry about than losing some photos.
I used to think this way until I started helping friends with iphones. There's no concept of local file, just things hosted in different places. My friend couldn't even download an image I hosted at website to their device.
You're over-engineering what is otherwise a straightforward solution for this particular instance. Instagram allows you to save stories to your mobile device, so...
1.) Download your story to your mobile device. Congratulations, you now have your own copy of your story that is yours and not under control of Instagram. You could stop here if you want, or you could...
2.) Copy the file to another device you might keep in your home. This could be a desktop, a laptop, a NAS, a generic external hard drive, whathaveyou. Congratulations, now you have three copies of this (Instagram's servers, your mobile device, and whatever third option you chose).
With video content like this, they're typically in popular formats that are unlikely to "go out of style" any time soon.
Beyond this particular instance? You're still over-engineering things. Most people are pretty simple - they want to keep their photos and videos, maybe some word documents and such, music and movies. Those formats are so standardized that all you need to do is store them on any electronic device you own at home, and move them to whatever new device you get when you upgrade. There's certainly a non-zero risk of device failure, but as we see in this very thread, there's also a non-zero risk of data loss in the cloud, so... c'est la vie.
Nobody really needs all of what you described in order to keep most of what they want.
Y'all are being weird about content from an online service that, I would assume, is meant to be shared with others, not hoarded on your local storage.
I don't know what IG "archiving" entails, does it remove stories from public view or something?
The main point of using an online service like IG is for serving and sharing your content. Not keeping it to yourself. IG stores and serves public content in a secure fashion, with very high availability and unparalelled reachability.
You've replied to my "over-engineering" with single-user hoarding solutions. Do you want to serve the content or not?
IG posts involve more than a JPEG. "Stories" are slideshows made of multiple items. There is metadata, tagging, other users: context. If you want to download a couple of JPEGs and lose all that context, you're not using IG anymore, you're hoarding.