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theriddlebrothers on 02/16/11

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Bash Backup Script

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#!/bin/sh
# full and incremental backup script
# created 07 February 2000
# Based on a script by Daniel O'Callaghan <[email protected]>
# and modified by Gerhard Mourani <[email protected]>
 
#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
fi