* Howard Thomson schrieb am 01.07.10 um 21:46 Uhr:
> Hi Kern,
>
> On Thursday 01 July 2010, Kern Sibbald wrote:
> > Hello Howard,
> >
> > What does "chunked" backup mean exactly? I am not sure what the high level
> > concept is here. Bacula can already backup multi-gigabyte virtual disks,
> > so
> > obviously you are thinking about something different.
>
> The concept that I am calling 'chunked backup' is sub-file incremental backup.
>
> Currently, for a 10Gb Virtualbox virtual disk, a Full-backup will backup the
> whole file.
>
> Subsequent incremental backups, where perhaps only 1Mb of the virtual-disk
> has changed,
> will backup the entire [10Gb] single file, because it has changed.
>
> Bacula currently records a hash-value for the entire file, whereas I am
> intending, in addition
> and for appropriately large files, to record a hash-value for sub-file
> chunks, to be able to selectively
> not backup those chunks when doing an incremental / differential backup.
This really sounds awesome! This would be a very useful feature!
Maybe a bit early, but ...
What do you think how to configure this? FileSet Options?
What comes to my mind is something like this maybe:
FileSet {
Name = "MyFileSet"
Include {
Options {
exclude = yes
regex = ".*/[Cc]ache/.*"
regex = ".*/lost+found"
}
Options {
signature = MD5
noatime = yes
aclsupport = yes
accurate = mcs
chunked files regex = ".*\.(vdi|vmdk)" # <---------------------------
chunk size = 1M # <---------------------------
}
File = /
}
}
-Marc
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