I created a thread (general installation forum) in March about problems which I encountered while upgrading debian to jesse. In response to my request, I received a lot of assistance in how to repair my system. However, it is not really working well and the only avenue I can see is to regenerate a new debian jesse system, a new ispconfig3 system and restore my two drupal 7 sites back to the new system. Is there an elegant way to save my present webs and restore them back to a newly installed server? Thanks.
This thread might help you to backup all data to migrate your system to a new server. https://www.howtoforge.com/community/threads/what-to-backup-ispconfig-and-need-to-know-how.41595/