I am wondering if it would be possible to Back Up your campaign file I.E. Save it as you go along, to your own hard drive. Not to use or work on it, but as a BackUp off site safety net. I had lost a total campaign but did have a back up on site, but I would like to back up all my campaigns but not have them cluttering up my Campaign Page. I am a Supporter so I'm not worried about the storage I'm thinking more about the reliability.
Other than that Loss of a Campaign, Roll20 has performed almost without a hitch and in the more than 20 sessions I've run over the last 2 months.