I haven't followed the development of bacula, so maybe this has been 
addressed in the past.

I was forever having trouble with laptop users not being on-line when 
backups fired off. A member from another forum provided the following 
script that can be run from cron on the bacula box. It tested out fine 
for me, and I thought others would find it useful. It will ping the 
hostname; if found, it will create a txt file and run a script with your 
bconsole commands. The next time cron runs, the script will check the 
date of the txt file, if the date is equal to today, it will not run the 
backup a second time.

enjoy :)

#!/bin/bash

HOST="windowshostname"

CMD="ping -c1 $HOST"
CMD_RET=`$CMD`
# echo $CMD_RET
NOWDATE=`date +%Y%m%d`

if [ -f ping_check.txt ];
then
      FILEDATE=`cat ping_check.txt`
else
      FILEDATE=0
fi

if [ $NOWDATE -ne $FILEDATE ];
then
      if [[ $CMD_RET =~ ", 0% packet loss" ]]
      then
           echo "$HOST pinged ..."
           echo $NOWDATE > ping_check.txt
         # run backup script
      else
           echo "$HOST did not ping ..."
      fi
fi

exit



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