HTCondorWiki: How To Configure Backfill

 slot_type_2 = cpus=$(BackfillCpusPerSlot) memory=$(BackfillMemoryPerSlot), gpus=0
 num_slots_type_2 = $INT(NumBackfillSlots)
 slot_type_2_BackfillSlot = True
-slot_type_2_start = (Owner == "$(BOINC_backfill)") && ($(Backfill_Resources_Exhausted) == False)
+slot_type_2_start = (Owner == "$(BOINC_owner)") && ($(Backfill_Resources_Exhausted) == False)
 slot_type_2_preempt = $(Backfill_Resources_Exhausted)
 slot_type_2_want_vacate = False
 {endcode}