To backfill Folding@Home on your execute node that is using static slots, use the following config
backfill_folding_at_home.config
# The local user to run FAH jobs as, you must create this user
#
FAH_Owner = backfill
# Folding at home settings, change to match your install path and work directory
# Each slot will use a subdirectory under this path named from the slotid of the slot
# e.g. /opt/fah/slot2, /opt/fah/slot3, etc.
#
FAH_HOME = /opt/fah
FAH_Executable = /usr/bin/FAHClient
# Arguments to the Folding@Home client for each slot, change this to match
# the cpus and memory of your slots
#
# Checkpoint every N minutes, default is 15
FAH_CheckpointArg = 15
FAH_CpusArg = 1
FAH_MemArg = $(DETECTED_MEMORY)/$(DETECTED_CPUS)*1024*1024
FAH_Arguments = --config $(FAH_HOME)/config.xml \
--data-directory . \
--checkpoint $INT(FAH_CheckpointArg) \
--client-threads $INT(FAH_CpusArg) \
--memory $INT(FAH_MemArg) \
--cpus $(FAH_CpusArg)
# the script that HTCondor will use to get FAH jobs, steal this script from HTCondor website
#
# this script extracts slot id from stdin and
# puts it into the environment as _CONDOR_BACKFILL_SLOTID=<SlotId>
# then runs
# condor_config_val -macro '$(FAH_JOB)'
# to generate a job classad for that slot
#
FAH_HOOK_FETCH_WORK = $(FAH_HOME)/fetch_work
#
# Template for the Folding@Home job that the FAH_FETCH_SCRIPT will return
#
FAH_JOB @=end
Cmd = "$(FAH_Executable)"
Iwd = "$(FAH_HOME)/slot$(BACKFILL_SLOTID)"
Owner = "$(FAH_Owner)"
User = "$(FAH_Owner)@$(UID_DOMAIN)"
JobUniverse = 5
Arguments = "$(FAH_Arguments)"
Out = "fah.out"
Err = "fah.err"
NiceUser = true
Requirements = (State == "Unclaimed") && ($(StateTimer) > 1200)
MaxJobRetirementTime = 0
JobLeaseDuration = 604800
RequestCpus = $INT(FAH_CpusArg)
RequestMemory = $INT(FAH_MemArg)
@end
#
# Enable work fetch for Folding@Home jobs and rank them
# lower than normal jobs
#
STARTD_JOB_HOOK_KEYWORD = FAH
RANK = $(RANK:0) - (Owner == "$(FAH_Owner)")