Re: Looking for a good incremental backup to a filesystem.

[Joshua Andrews <josh@xxxxxxxxxxxx>]

Steven W. Orr wrote:

> I've been running a cronjob to backup what I think is important but I was 
> thinking I'd be better off with an incremental setup to save space. Does 
> anyone have something already written (before I go off and write the next 
> one)? My daily backup is currently about 400M incremental would probably 
> save me a ton of space.
>
> TIA
>
>  
Attached is an old backup script - I can't remember where I got it but 
it might save some rewrite time.

-J
#!/bin/sh
# full and incremental backup script
# created 07 February 2000
# Based on a script by Daniel O'Callaghan <danny@xxxxxxxxxxx>
# and modified by Gerhard Mourani <gmourani@xxxxxxxxxx>

#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