Backup Script

[Robert Davison]

Im trying to write a small backup script which I have put in /etc/periodic/weekly. The script is as follows......
   
  #!/bin/sh
#
#weekly backup of chosen files
#
if
then
        tar -cf /dev/sa0 /var/ftp /home /etc /usr/local
        echo "backing up the disks"
else
        echo "There was a problem" 1>&2
        exit 1
fi
  echo "Finished at `/bin/date`."
exit

   
  Now I have no experience at bash scripting as was wonderng if someone could give me some help with the if statement. Basically im trying to test to see if the machine knows that /dev/sa0 (my tape drive) is accessable. If it is then it continus to the backup, if not then it gives the error message and echos the date.
   
  Any help would be much appreciated.


 		
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