Eh, sure OP could do that. Does seem a bit over the top for OP to pursue the most complicated backup solution possible :D Maybe as a strange experiment to see how it goes, not as a trusted backup solution. (like you said not for critical data)
IPFS would also require more bandwidth vs just about any other solution since it has to constantly talk to other IPFS nodes. And more finicky, last I used IPFS the client would run into memory leaks and other weirdness requiring restarts every now and then (hopefully it's more stable for long-term runs nowadays).
Does it? I'm kind of thinking if people insist on browsing Lemmy in All mode, and forcing themselves to view everything they they don't want to view, then it's on them to learn how to block communities in their own profile settings. Or if you want to help them somehow, maybe some way to display a quick how-to to show people how to block communities and/or browse in Subscribed mode could be useful. Just not sure how feasible that would be overall if people are browsing All and just reacting to things they don't want to see.
For me browsing Lemmy in Subscribed mode and purposely subscribing to communities I'm interested in works well enough, no need to wade into the for/against AI drama or any other topics I'm not interested in.