Note: This error is not the same as "Config Mismatch" Contact ETC Tech Services if you are seeing config mismatch.
If Backup looks are not important to you, the easiest way to clear out the error is to [Clear All] Backup looks. You can then re-record them at a later time. Note that if you are receiving "Backup Mismatch" errors, you can go to the offending CEM and select [Rack]  use [right arrow] till you see "Update Backup from" press [Enter], and select the rack that contains the correct Backup looks. This will update the Backup looks in the offending CEM. Alternatively, the Backup looks can be updated from its own rack, which will update the information in the adjacent racks.