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Comments and suggestions concerning this book should be mailed to gmourani@videotron.ca © Copyright 1999-2000 Gerhard Mourani and Open Network Architecture ® 453 We suggest that you set this script up and run it at the beginning of the month for the first time and for a month before making major changes. In our example bellow we do the backup to a directory on the local server (BACKUPDIR), but you could modify this script to do it to a tape on the local server or via NFS mounted file system. Step 1 Create the backup script backup.cron file (touch /etc/cron.daily/backup.cron) and add the following lines in this backup file: #!/bin/sh # full and incremental backup script # created 07 February 2000 # Based on a script by Daniel O'Callaghan <danny@freebsd.org> # and modified by Gerhard Mourani <gmourani@videotron.ca> #Change the 5 variables below to fit your computer/backup COMPUTER=deep                             # name of this computer DIRECTORIES="/home"                        # directoris to  backup BACKUPDIR=/backups                          # where to store the backups  TIMEDIR=/backups/last-full                   # where to store time of full backup TAR=/bin/tar                              # name and locaction of tar #You should not have to change anything below here PATH=/usr/local/bin:/usr/bin:/bin DOW=`date +%a`                 # Day of the week e.g. Mon DOM=`date +%d`                  # Date of the Month e.g. 27 DM=`date +%d%b`               # Date and Month e.g. 27Sep # On the 1st of the month a permanet full backup is made # Every Sunday a full backup is made - overwriting last Sundays backup # The rest of the time an incremental backup is made. Each incremental # backup overwrites last weeks incremental backup of the same name. # # if NEWER = "", then tar backs up all files in the directories  # otherwise it backs up files newer than the NEWER date. NEWER # gets it date from the file written every Sunday. # Monthly full backup if [ $DOM = "01" ]; then         NEWER=""         $TAR $NEWER -cf $BACKUPDIR/$COMPUTER-$DM.tar $DIRECTORIES fi # Weekly full backup if [ $DOW = "Sun" ]; then         NEWER=""         NOW=`date +%d-%b`         # Update full backup date          echo $NOW > $TIMEDIR/$COMPUTER-full-date         $TAR $NEWER -cf $BACKUPDIR/$COMPUTER-$DOW.tar $DIRECTORIES # Make incremental backup - overwrite last weeks  else         # Get date of last full backup         NEWER="--newer `cat $TIMEDIR/$COMPUTER-full-date`"         $TAR $NEWER -cf $BACKUPDIR/$COMPUTER-$DOW.tar $DIRECTORIES