Make backup for given host's /etc/ by one command ( by using BackupPC )

backuppcetc.sh

#!/bin/bash
#1) Ask for host
if [ -z $1 ];
then
  echo -n "Host to backup and press [ENTER]: "
  read sourcehost
else
  sourcehost=$1
fi

#2) If host is unknown create configuration
if [ `sudo grep "^$1\s" "/etc/backuppc/hosts" | wc -l` -ne "1" ]; 
then 
  echo "$sourcehost  0       backuppc        vitex" | sudo -u backuppc  tee --append /etc/backuppc/hosts > /dev/null
  echo "\$Conf{RsyncShareName} = [  '/etc' ]; " | sudo -u backuppc  tee --append "/etc/backuppc/$sourcehost.pl" > /dev/null
  sudo service backuppc restart
  if [ -z $(sudo -u backuppc ssh $sourcehost 'which rsync') ];
  then
    echo NO RSYNC on $sourcehost
    ssh $sourcehost 'DEBIAN_FRONTEND=noninteractive apt-get -y install rsync'
  fi
fi

#3) Sync /etc
curl -s "http://backuppc:HTPASSWORD@localhost/backuppc/index.cgi?host=$sourcehost&hostIP=$sourcehost&doit=1&action=Start_Full_Backup" | grep "Reply from server"