Before RMF can do anything, it needs to identify which recorders are the primaries (the “live” capture points) and which are the secondaries (the backups). During the Server Labeling step, you tag each recorder as either Primary or Secondary. RMF then builds its device list exclusively from these labeled servers; anything left untagged is treated as out of scope, and its cameras never appear in the UI or participate in synchronization or failover. In short, no label, no redundancy—so be sure every recorder that should participate is labeled before you move on to pairing.