I have hundreds of pages of notes/notebooks in Evernote and Onenote and recently I've needed to collaborate with others on Google Docs. I need a good syncing app that syncs all of my documents together. In this case, syncing means not just copying files, but actually converting them. Evernote, Google Docs and Onenote use different formats for word processing. The app should be web-based because cnce the files are synced, it doesn't matter which operating system I access the files on (windows, Android, ios, etc.)
I've used zapier and IFTTT but, unfortunately, they only trigger a sync to create new notes written on Evernote into Google Docs and Onenote. They don't seem to copy/backup older notes nor can they sync new notes written on Docs or Onenote.
There is an app I experimented with called CloudHQ which actually does everything! But it's expensive. I'd like to use a free app.