This has been a serious concern of mine. In the event that I prematurely die I have everything set up with automatic updates, so that hopefully my family can continue to use the self-hosted services without me.
Nextcloud will not stop shitting the bed. I’d give it a few months at most if I died, at which point my family would likely turn back to Google Drive.
I’m looking for a more reliable alternative, even if it’s not as feature-rich.