Many articles mention that Kanban Backlog feature would be found in JIRA Software Labs. Although I do not see this option anywhere including this particular article
https://confluence.atlassian.com/jirasoftwarecloud/blog/2016/02/make-way-for-backlogs-in-kanban-boards
I believe this is a bug: https://jira.atlassian.com/browse/JSW-11878
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