There is no provision for BACKUP TEAMS at the FIRST Championship.
Instead, before each division Playoff Tournament, ALLIANCES are selected per the process as described in section 10.6.1 ALLIANCE Selection Process, however the process continues with a third round of selection as follows.
Round 3: The same method is used for each ALLIANCE CAPTAIN’S third choice except the selection order is reversed again, with ALLIANCE 1 picking first and ALLIANCE 8 picking last. This process results in 8 ALLIANCES of 4 teams each.
ALLIANCES may start with any 3 of the 4 ROBOTS on their ALLIANCE during division Playoff MATCHES and during the Championship Playoffs. ALLIANCES submit LINEUPS for their MATCHES as described in section 10.6.4 LINEUPS.