Same here. After going through different formats (Zim, Markdown, org-mode) I settled on org-mode and haven't looked back. I think that other note-taking systems only exist because whoever wrote them hasn't tried org-mode.

I also use vdirsyncer with DavX to sync my phone's calendar and contacts to my notes directory, so that is backed up as well - all in the same syncing script.

  #!/usr/bin/env bash
  cp -a ~/.vdirsyncer/calendars/ ~/Notes/pim/
  cp -a ~/.vdirsyncer/contacts/ ~/Notes/pim/
  git add \*
  git commit -am "$(hostname)"
  git pull
  git push
  echo ''
  git status