* Kern Sibbald schrieb am 17.05.08 um 14:59 Uhr:
> Item 3: Merge multiple backups (Synthetic Backup or Consolidation)
> Origin: Marc Cousin and Eric Bollengier
> Date: 15 November 2005
> Status:
>
> What: A merged backup is a backup made without connecting to the Client.
> It would be a Merge of existing backups into a single backup.
> In effect, it is like a restore but to the backup medium.
>
> For instance, say that last Sunday we made a full backup. Then
> all week long, we created incremental backups, in order to do
> them fast. Now comes Sunday again, and we need another full.
> The merged backup makes it possible to do instead an incremental
> backup (during the night for instance), and then create a merged
> backup during the day, by using the full and incrementals from
> the week. The merged backup will be exactly like a full made
> Sunday night on the tape, but the production interruption on the
> Client will be minimal, as the Client will only have to send
> incrementals.
>
> In fact, if it's done correctly, you could merge all the
> Incrementals into single Incremental, or all the Incrementals
> and the last Differential into a new Differential, or the Full,
> last differential and all the Incrementals into a new Full
> backup. And there is no need to involve the Client.
>
> Why: The benefit is that :
> - the Client just does an incremental ;
> - the merged backup on tape is just as a single full backup,
> and can be restored very fast.
>
> This is also a way of reducing the backup data since the old
> data can then be pruned (or not) from the catalog, possibly
> allowing older volumes to be recycled
>
This sounds like a very useful Feature.
Would there be a way to combine this with some sort of data-deduplication?
Deduplication is "just" writing Metadata for a client and not
putting the data on tape because it has already been written to tape
by another client.
Think of "hard-linking" Datablocks on tape.
Further there could be an option tp specify a minimum and a maximum
number of mediums that each data block has to be spread on.
This would bring a real "killerfeature" useful for most users into bacula
that is offered only by commercial enterprise backup solutions so
far (AFAIK)
-Marc
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