Our raid copys to one of two existing exteral drives in the system based of UUID. If one or the other is plugged in, it detects the drive and rsyncs the raid to the drive. Just plug in the drive, remove the other and take off site. That simple.

#!/bin/bash

UUID=$(ls /dev/disk/by-uuid | grep 9702537b-b84c-44cf-b417-eaaf95a6d240) 
STATUS=$?
if [ $STATUS == 0 ] ; then
  echo "detected:$UUID"
  DEVICE=`ls /dev/disk/by-uuid/9702537b-b84c-44cf-b417-eaaf95a6d240 -l | awk -F/ '{print $NF}'`

  if [ _"`grep /dev/$DEVICE /etc/mtab`" = _ ] ; then
      echo "Device /dev/$DEVICE is not mounted"
      mount -t ext3 -U 9702537b-b84c-44cf-b417-eaaf95a6d240 /mnt/usb_raid_rotate_1 -o rw,acl
      if [ $? -eq 0 ] ; then 
        echo "Mounted $DEVICE" 
      fi
  else
      echo "Device /dev/$DEVICE is already mounted"
  fi

  echo '##############################'
  echo '  raid_copy_rotate_2 '
  echo '##############################'

  rsync -avA --delete -e "ssh -p 34011 -i /root/.ssh/identity" --exclude=vdi/ root@x.x.x.x:/mnt/raid5/ /mnt/usb_raid_rotate_1/full_raid_copy/
  if [ $? -eq 0 ] 
  then 
    echo "****************************  usb_raid_rotate_2 synced nicely" 
  else 
    echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!  errors while syncing usb_raid_rotate_2" 
  fi

  umount /mnt/usb_raid_rotate_1
  if [ $? -eq 0 ] 
  then 
    echo "****************************  usb_raid_rotate_2 unmounted nicely" 
  else 
    echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!  errors unmounting usb_raid_rotate_2" 
  fi
fi

UUID=$(ls /dev/disk/by-uuid | grep 668260a9-1f6e-4091-978e-89425ad33cf5) 
STATUS=$?
if [ $STATUS == 0 ] ; then
  echo "detected:$UUID"
  DEVICE=`ls /dev/disk/by-uuid/668260a9-1f6e-4091-978e-89425ad33cf5 -l | awk -F/ '{print $NF}'`

  if [ _"`grep /dev/$DEVICE /etc/mtab`" = _ ] ; then
      echo "Device /dev/$DEVICE is not mounted"
      mount -t ext3 -U 668260a9-1f6e-4091-978e-89425ad33cf5 /mnt/usb_raid_rotate_2 -o rw,acl
      if [ $? -eq 0 ] ; then 
        echo "Mounted $DEVICE" 
      fi
  else
      echo "Device /dev/$DEVICE is already mounted"
  fi

  echo '##############################'
  echo '  raid_copy_rotate_2 '
  echo '##############################'

  rsync -avA --delete -e "ssh -p 34011 -i /root/.ssh/identity" --exclude=vdi/ root@x.x.x.x:/mnt/raid5/ /mnt/usb_raid_rotate_2/full_raid_copy/
  if [ $? -eq 0 ] 
  then 
    echo "****************************  usb_raid_rotate_2 synced nicely" 
  else 
    echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!  errors while syncing usb_raid_rotate_2" 
  fi

  umount /mnt/usb_raid_rotate_2
  if [ $? -eq 0 ] 
  then 
    echo "****************************  usb_raid_rotate_2 unmounted nicely" 
  else 
    echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!  errors unmounting usb_raid_rotate_2" 
  fi
fi