LinuxQuestions.org - help with backup script

I am wondering if anyone could help with a backup script. I am kind of new to this scripting stuff, so any help would be great. Here is the code I am using:

Code:

#/bin/bash

#linux/windows backup script for network shares

#to external hard drive

#written by: dennis williams

#june 29, 2004

#

#-------These are the environment variables----------------

#

$USERNAME1=username

$PASSWORD1=password

$TARGET_MACHINE=target_machine_name

#

#-------Backup_share can also be set where "mount -t smbfs" is below

#-------this is good if there are spaces in the share name

#

#$BACKUP_SHARE=name_of_the_share_on_the_windows_computer

#

#------------End Variables---------------------------------

#

#------------where all of the work is done-----------------

#

#if mount | grep -q /mnt/backup; then 

#    echo "backup is already in progress" >&2 

#    exit 1 

#fi 

#mount -t smbfs "//$TARGET_MACHINE/$BACKUP_SHARE" /mnt/backup -o "password=$PASSWORD1,username=$USERNAME1" 

#(cd /mnt/backup; tar -cvp .) | bzip2 >"$DRIVE/$TARGET_MACHINE.tar.bz2" 

#umount /mnt/backup

#

#-----------checks to see if the backup has already started------------

#

if mount |grep -q /mnt/backup; then

  echo "backup is already in progress" >&2

  exit 1

fi

#

#---------------------------ends the check-----------------------------

#

mount -t smbfs "//$TARGET_MACHINE/$BACKUP_SHARE" /mnt/backup -o "password=$PASSWORD1, username=$USERNAME1"

(cd /mnt/backup; tar -cvp .) | bzip2 >"$DRIVE/$TARGET_MACHINE.tar.bz2"

umount /mnt/backup

#

#-------------------------end of script--------------------------------

#----you will be left with a tar file with the name of the computer----

#

and this is the error I am getting:

Code:

-----ends the check---

#

mount -t smbfs .... etc

*

Could not resolve mount point /mnt/backup

(cd /mnt/backup; tar -cvp .)bzip2 >$DRIVE/$TARGET_MACHINE.tar.bz2

laptop.txt: line 40: cd: .mnt/backup: No such file or directory

./

./cron.txt

./backup.txt

./master.txt

./drive

./christa.txt

./laptop.txt

umount /mnt/backup

umount: /mnt/backup: not found

#

That is the code and the error, is anyone able to help out??

Thanks,

Dennis