What about saving all your content on your own relay? I've got one raspberry pi where this runs. Only purpose is to save own content.
Discussion
A possibility. But this is not a problem of storage (on relays), none of the notes had been deleted from the relays (not from all of them at least). Nostr.band displays everything correctly, Damus doesn't.
I'm not that attached to my shitposts really, I just like this to work well in all major apps. We'll get there.