We tried, but could not find /doku.php?id=doku.php.faq:systemadmin:what_is_the_best_way_to_backup_my_citadel_installation&do=login§ok=6f2d28d7bfdbbdaa9fc8f6ac75e66852
But hey, you don't have to leave empty handed!
Here are some things you can try instead: