BackupPC-users

Re: [BackupPC-users] Problem with BackupPC and share SMB

2009-08-25 11:10:17
Subject: Re: [BackupPC-users] Problem with BackupPC and share SMB
From: Adam Goryachev <mailinglists AT websitemanagers.com DOT au>
To: "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
Date: Wed, 26 Aug 2009 01:06:20 +1000
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Alessio Oss wrote:
>>> Why?     Other people have the same problem?
>> Why?  Because you're using SMB, which is using time/date stamps to
>> determine what goes in the incremental backup, and the files haven't
>> changed.
> 
> Why not?
> They are the same but are on a different position and despite i think

Right, they are the same (old) timestamp, hence they are skipped from
the new incremental backup.

> that if the system intends to mantain the old files due to the fact that
> they are the same it should show the new positions withouth copying
> the old files but linking anyway to the same inode.

Except "the system" doesn't know about the new position, because no
files have even been backed up in this new position.

> in this case we have no transfer and a backup of the real situation.

That would be ideal, but is not the case.

> If i have many files i'm not sure that the backup does the right thing.

Correct, so you have a couple of choices (detailed below)

> I understand that this is not a problem but visually is very strange to
> find that the reshuffled dir results empty.
> Any hint?

Yes, 2 in fact.
1) Use rsync for backups

2)
>> So if you're going to go around reshuffling directories and
>> using SMB, you're best off doing a full backup afterward.

Or, 3) Read the documentation that tells you that incremental tar/smb
backups will miss files with old timestamps, which usually occur when
renaming/moving files/directories, or un-archiving files. Of course,
there are other methods of creating files with an old timestamp where
this can occur as well. If it is really a problem, make all backups a
full, or use another protocol which can test for files based on data
other than just timestamp (ie, rsync)

Regards,
Adam
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