>>>>> On Mon, 11 Jul 2005 20:35:46 +0200, Kern Sibbald <[EMAIL PROTECTED]> said:
Kern> On Monday 11 July 2005 18:50, Phil Stracchino wrote: >> On Mon, Jul 11, 2005 at 11:44:36AM +0200, Ren? Brask S?rensen wrote: >> > Hi All >> > >> > Don't know if this is the right list to ask. >> > >> > I have been looking through the bacula documentation but couldn't find >> > anything about delta compression. Do backula support any kind of delta >> > compression ? or are there any plans for implementing it i future >> > releases ? I'm asking because it frustrates me that I every night >> > transfer one file that's over 1Gb. If I had a tool which supports delta >> > compression I could greatly reduce the amount of data transfered. >> >> This is something that has been discussed in the past, but no-one has >> yet worked on an implementation to my knowledge. Kern> I haven't read about how rsync and zsync work, but I suspect that it is called Kern> delta comparison rather than delta compression since the incremental backup Kern> of only what changed is based on a rolling file signature or checksum rather Kern> than a compression technique. In fact, compressing the files can create Kern> important problems for these techniques. Kern> I don't see how the same technique can be used with Bacula or any other Kern> program that does not store the files in a directory tree on disk. These Kern> techniques seem to require having the previously backed up file available for Kern> comparison during subsequent backups. If someone has an idea how to Kern> implement this without having backed up files online, please let me know. Maybe storing the checksums of the original file blocks would suffice? That is still a significant amount of data, but less than the file itself. __Martin ------------------------------------------------------- This SF.Net email is sponsored by the 'Do More With Dual!' webinar happening July 14 at 8am PDT/11am EDT. We invite you to explore the latest in dual core and dual graphics technology at this free one hour event hosted by HP, AMD, and NVIDIA. To register visit http://www.hp.com/go/dualwebinar _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
