i'm currently restoring a 8.6 P4 upgraded to 8.6 P14 before migration with rsync as of this post : https://wiki.zimbra.com/wiki/Steps_To_R ... ZCS_Server
Hope it will work, (and that none of the binary file listed in this "howto" is compromised.. you should try it. Change all the passwords anyway (zmldappassword etc.. )
PostScriptum : zmbackup isn't available for 8.6 version.
PostScriptum2 : ZextraSuite seems heavy, and not being sure that the Trial will get the full backup from the free tool : "zextra migration tool", my first try will be with rsync.
--> is ZimbraSuite Trial working for a real restore from ZextraMigrationTool backup ? As really free ? (ZextraMigrationTool is free ok, but to import the backup, question is still there.. )
PS : and you are alright shell from the patch : [.install.sh] does'nt update the files anymore after begin passed only one time... ( like : checksum control with the patch... ) It apparently does just check the current version... if patched when already hacked.. this is useless indeed.