--- On Wed, 9/3/08, Alberto Rial <rial AT ardan DOT es> wrote:

  

From: Alberto Rial <rial AT ardan DOT es>
Subject: Re: [Bacula-users] Mail Server Incremental Backup size of full backup
To: "Mark Nienberg" <gmane AT tippingmar DOT com>
Cc: bacula-users AT lists.sourceforge DOT net
Date: Wednesday, September 3, 2008, 2:13 AM
Mark Nienberg escribió:
    

Alberto Rial wrote:
  
      

     I have a mail server running Debian 4.0 and
        

bacula version  
    

2.2.8-8~bpo40+1 installed from debian backports.
        

The mail server runs 
    

postfix + courier-imap and size of full backup
        

it´s 108 Gb aprox.
    

    I´ve got a lot of machines on the network who
        

are been backed up 
    

succesfully, but the mail server sometimes when
        

run a incremental 
    

backup, it´s seems to be an incremental but
        

bacula copy all data like in 
    

a full.
    
        

If you store your mail messages in traditional unix
      

mbox format then any new messages 
    

or deleted messages for one user will change the mbox
      

file for that user and the 
    

backup will include all of that user's mail (since
      

it is all in one file).
    

To get true incremental backups for user mailboxes you
      

would need to use one of the 
    

formats that stores messages as individual files, like
      

Maildir.
    

Is that the problem or do you already use Maildir
      

format?
    

Mark Nienberg



      

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I´m aleady using Maildir format...  Some of the
incremental backups runs 
fine (about 700 Mb of daily changes) while some of them
(generally 
sunday night incremental) has the same size that a full
backup (about 
108 gb). If I delete this backup (Incremental with full
size) next 
backup size will be 108 gb, if i don´t delete it next
backup runs fine 
(about 700 mb).

Thanks.


Alberto Rial.
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It looks like some process that runs on Sunday changes ctime of the files. I had similar problem where my old backup system (Veritas NetBackup) and bacula were running together for few months and Veritas would change ctime of the file because it was resetting the atime of the file and bacula would back it up even though it did not change. Many of my incremental backups were the size of full backup.




Hemant Shah
E-mail: hjrrs AT yahoo DOT com