scripts/FreeBSD/vm/vm-backup.csh

#!/bin/csh

## config section
set vm_dataset     = "zroot/vms"
set backup_dataset = "tank/backup/bhyve"
set backup_date    = `date "+%Y-%m-%d"`

# Snapshot all VMs
echo ""
echo "################# SNAPSHOT VM #################"
foreach vm (`ls /usr/vms | \
    grep -v .config | \
    grep -v .iso | \
    grep -v .templates`)

  ## stopping vm
  vm stop $vm

  ## give vm time to shut down properly
  sleep 15
  
  ## snapshot vm
  echo "Snapshot VM: $vm" 
  zfs snapshot $vm_dataset/$vm@$backup_date
  echo ""

  ## start VM
  vm start $vm
  echo ""

end

# Backup all VM snapshots
echo ""
echo "################## BACKUP VM ##################"
foreach vm (`ls /usr/vms | \
    grep -v .config | \
    grep -v .iso | \
    grep -v .templates`)

    ## Create ZFS dataset
    echo "Creating destination dataset for $vm"
    zfs create $backup_dataset/$vm-$backup_date
 
    ## Send snapshot to backup destination
    echo "Backup VM: $vm" 
    zfs send $vm_dataset/$vm@$backup_date | zfs recv -F $backup_dataset/$vm-$backup_date
    echo ""

    ## Delete snapshot 
    zfs destroy $vm_dataset/$vm@$backup_date

end

# report done
echo ""
echo "############### ALL DONE THANKS ###############"
echo ""