Forgot to mention one other item. My installation has an acl directory that seems critically important to back up, with acl.auth.php and users.auth.php files. However,
https://www.dokuwiki.org/faq:backup does not mention the acl directory, so the documentation seems misleading. Could someone advise on this?
BTW, I guess for convenience, and to make sure nothing missed, I will back up the entire contents of /var/lib/dokuwiki and /etc/dokuwiki directories (again, I'm running Ubuntu), probably using rsync, maybe using tar. Any comments on that?
Daniel