Do a full backup of your data before hand (like, stop SMTP incoming, then do a backup, then do the upgrade).
Also, familiarize yourself with this:
https://github.com/jaymzh/recover-cyrus
(Full disclosure, that is my repo) If the migration fails, that script and README will help you recover and migrate all of your mailboxes.
------------------------------------------
Cyrus: Info
Permalink: https://cyrus.topicbox.com/groups/info/Ta01e6935b46972c7-M26adb084ff1f2fbaae0df0cb
Delivery options: https://cyrus.topicbox.com/groups/info/subscription
lmpx.com only provides a reader for public news (NNTP) servers. It is not
affiliated with the servers or forums shown here and is not responsible for
the content of articles, which is written by their respective authors.