[ZODB-Dev] Backing up Data.fs and blob directory

[Laurence Rowe]

Hi Adam,

For incremental backups, I presume the procedure would be to first run
repozo on the Data.fs then run rsync on the blobs directory to the backup
blobs directory.

The concerns would be equivalent to those on doing a full backup.

Laurence


Adam Groszer-2 wrote:
> 
> Hello Laurence,
> 
> My only fear is that until today the preferred procedure to backup
> ZODB was using repozo.py (if I don't miss there something).
> It would allow doing backup while the app is online. And most of the
> time we want to do that. Also incremental backups only when needed.
> 
> I guess repozo.py is not (yet) aware of BLOBs.
> So the question would be, how to make backups with BLOBs?
> 
> Wednesday, September 3, 2008, 5:06:36 PM, you wrote:
> 
> LR> Backing up a ZODB has always been fairly easy in the past, but with
> the
> LR> introduction of blobs things have got a little more complex.
> 
> LR> How should I create a consistent backup of my Data.fs and blob
> directory?
> 
> LR> My inital guess would be to take a copy of the Data.fs, then take a
> copy of
> LR> the blob directory to ensure I have all blobs referenced in the
> Data.fs.
> LR> Would I be able to restore from such a backup safely? (it may contain
> blobs
> LR> from transactions that were newer than the backed up Data.fs).
> 
> LR> This should be safe because committed blobs are immutable and any
> dangling
> LR> blobfiles would not interfere with the creation of blobs from new
> LR> transactions in the restored zodb, as transaction ids would not
> overlap.
> 
> LR> I would be greatful if anyone could point out holes in my reasoning or
> has
> LR> experience of this.
> 
> LR> Laurence
> 
> 
> -- 
> Best regards,
>  Adam GROSZER                            mailto:agroszer at gmail.com
> --
> Quote of the day:
> There will come a time when you believe everything is finished. That will
> be the beginning. 
> - Louis L'Amour 
> 
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