If you are working off a long Backlog (like we do at Kerika!), then you will have many Scrum Boards that pull items off this shared Backlog over time, and with our new Archive feature you will want to freeze old Scrum Boards as you get done with Sprints.

(Each Sprint should be done as a separate Scrum Board, that connects to the same Backlog.)

When you archive one particular Scrum Board, you only freeze that board: the Backlog remains available for use — and modification — by other Scrum Boards, now and in the future.

Which means that when you open an Archived Scrum Board, the view you will get of the Backlog will show the Backlog as it exists today, not as it existed when you archived the Scrum Board.