Yeah, seems neither self-host (onemodel) or letting someone else (you or Evernote) is particularly attractive, because the chance of data loss is always there.
Is it possible there is a solution that makes the data more permanent and allows multiple parties to backup the same sources, or something similar? Some sort of federation protocol maybe.
Thanks. That is on the future roadmap (though I have been slow lately): selective sharing/copying/synch. I encourage anyone with possible interest to sign up for the announcements list at least, and maybe decide sometime to help. :)