I added the status 'Backlog' to my workflow
I filtered my backlog by 'To Do' status and bulk changed the items in the backlog (not in a sprint) that were 'To Do' to be in 'Backlog' status
My backlog view no longer shows these issues. All quick filters have been cleared.
When I use the filter for my board in search the issues in 'Backlog' status are in the search results. The filter is simply project = MYPROJECT ORDER BY Rank ASC
The backlog is not associated with a column on my scrum board for the active sprint because issues in 'Backlog' should not be in the active sprint.