From nadeem.m.khan@gmail.com Thu Feb 23 12:56:20 2006
From: "Nadeem M. Khan" <nadeem.m.khan@gmail.com>
To: linuxers@mm.ilug-bom.org.in
Subject: [ILUG-BOM] Differential backups with tar.
Date: Thu, 23 Feb 2006 12:56:11 +0530
Message-ID: <1140679570.2480.24.camel@nadeemdesk>
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Hi.

I've been trying to get differential backups with tar. I've got it
working nice and fine except for one problem. If a file is modified
after the last full backup, it gets included in my differential backup,
as it should. But my differential backup also includes directories that
have not been modified since the last full backup. These directories get
included as empty directories. The files in them (rightly) do not get
included in the differential. 

To create a full backup I do:

tar cvf /backups/full.tar /home

To create a differential, I use the timestamp of the full backup archive
as a reference:

tar cvf /backups/diff.tar --newer="`date -r /backups/full.tar`" /home

Works well, except for the directory inclusion part. Am I missing
something?

Regards,
NMK.



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From lists@anoan.com Fri Feb 24 06:45:31 2006
From: benoy <lists@anoan.com>
To: linuxers@mm.ilug-bom.org.in
Subject: Re: [ILUG-BOM] Differential backups with tar.
Date: Fri, 24 Feb 2006 06:46:22 +0530
Message-ID: <43FE5E66.7090203@anoan.com>
In-Reply-To: <1140679570.2480.24.camel@nadeemdesk>
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Nadeem M. Khan wrote:
> Hi.
> 
> I've been trying to get differential backups with tar. I've got it
> working nice and fine except for one problem. If a file is modified
> after the last full backup, it gets included in my differential backup,
> as it should. But my differential backup also includes directories that
> have not been modified since the last full backup. These directories get
> included as empty directories. The files in them (rightly) do not get
> included in the differential. 
> 
> To create a full backup I do:
> 
> tar cvf /backups/full.tar /home
> 
> To create a differential, I use the timestamp of the full backup archive
> as a reference:
> 
> tar cvf /backups/diff.tar --newer="`date -r /backups/full.tar`" /home
> 
> Works well, except for the directory inclusion part. Am I missing
> something?
> 
for differential backups I will suggest rsync
I am running below script by cron job every day
which will create differential backup(daily basis) on current 
folder and moved only changed file to another folder called
changes/`date +%d%m%y`. And verbose mode will generate a 
detailed  report on email every time. And recovery is very easy.

<script>
#!/bin/sh
export PATH=/usr/local/bin:/usr/bin:/bin

BDIR=/path/to/source/folder/
TARGBASE=/backupfolder/current
TARGBASE_PREV=/backupfolder/changes

# excludes file - this contains a wildcard pattern per line of 
files to exclude
EXCLUDES=/path/to/excludes

BACKUPDIR=`date +%d%m%y`
OPTS="--force --ignore-errors --exclude-from=$EXCLUDES --delete 
--backup --backup-dir=$TARGBASE_PREV/$BACKUPDIR -av"

rsync $OPTS "$BDIR" $TARGBASE/current
</script>

Hope this helps and you can find more resource from
http://rsync.samba.org/examples.html

/Benoy


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From nadeem.m.khan@gmail.com Fri Feb 24 22:39:36 2006
From: Nadeem M Khan <nadeem.m.khan@gmail.com>
To: linuxers@mm.ilug-bom.org.in
Subject: Re: [ILUG-BOM] Differential backups with tar.
Date: Fri, 24 Feb 2006 22:40:14 +0530
Message-ID: <98b265ee0602240910x7605a506ifb3cf6b50cf5e6b@mail.gmail.com>
In-Reply-To: <43FE5E66.7090203@anoan.com>
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On 2/24/06, benoy <lists(a)anoan.com> wrote:
>
>
> for differential backups I will suggest rsync


I backup to a tape. I too have a script, but posted only the relevant lines
to isolate the issue. Could anyone else suggest a differential backup scheme
using tar (and not any third-party tools like amanda)?

Regards,
NMK.

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From amitabhmca@yahoo.com Sat Feb 25 14:30:34 2006
From: amitabh pandey <amitabhmca@yahoo.com>
To: linuxers@mm.ilug-bom.org.in
Subject: Re: [ILUG-BOM] Differential backups with tar.
Date: Sat, 25 Feb 2006 01:00:40 -0800
Message-ID: <20060225090040.55019.qmail@web36215.mail.mud.yahoo.com>
In-Reply-To: <98b265ee0602240910x7605a506ifb3cf6b50cf5e6b@mail.gmail.com>
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HI Nadeem,

Please visit this URL--www.netadmintools.com

You will get your solution ...


Thanks
AMitabh

Nadeem M Khan <nadeem.m.khan(a)gmail.com> wrote: On 2/24/06, benoy 
 wrote:
>
>
> for differential backups I will suggest rsync


I backup to a tape. I too have a script, but posted only the relevant lines
to isolate the issue. Could anyone else suggest a differential backup scheme
using tar (and not any third-party tools like amanda)?

Regards,
NMK.
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