At the VERY least, you're going to need to find citadel.config and citadel.control files, and copy them to /usr/local/citadel/ along with your database in /usr/local/citadel/data/
https://www.citadel.org/file_layout.html might give some hints as to where to find the rest of the files, but the above two are the only ones you definitely need. Among others are: netconfigs/ - mailing lists, RSS feeds, etc. files/ - upload/download libraries keys/ - SSL keys and certificates bio/ - user profiles (not the accounts themselves) images/ - room banner images roominfo/ - room banner text userpics/ - user profile photos So if you're just using Citadel for email then you can probably get away with just citadel.config and citadel.control along with the database. And yes, I have in the past been able to use "imapsync" and/or "imapcopy" tools to migrate organizations from some other email system to Citadel, so there's no reason it wouldn't work for migrating Citadel to Citadel.
