* 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 -- 8AAC 5F46 83B4 DB70 8317 3723 296C 6CCA 35A6 4134 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Bacula-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bacula-devel
