This functionality allows you to indicate that certain spaces inside a campaign are for backup.
The campaign will not normally be shown on those spaces. However, if by any chance it is delayed, it will start being displayed on those spaces. When the campaign is up to date again, it will no longer be displayed on the backup spaces.
When creating/editing a campaign, you should select all the spaces: ordinary and backup ones:
Then, on the “Edit spaces” page, you will be able to specify which the backup spaces are by checking boxes:
On the campaign view page, it will be shown if a space is a backup space or not. Moreover, if it is a backup space, you will be able to determine whether it is active or not at that particular moment:
When the campaign is delayed, those backup spaces will become active until the campaign normalizes its delivery:
If the campaign is copied, the “backup” spaces configurations will also be copied.