hi,
Am Dienstag, den 25.11.2008, 15:44 -0500 schrieb Jeffrey J. Kosowsky:
> Achim J. Latz wrote at about 17:42:17 +0100 on Tuesday, November 25, 2008:
> > For my company Qustodium Internet Security, I am in the process of
> > developing a VM appliance that will enable small (Windows-centric) networks
> > to enjoy the benefits of BackupPC.
> >
> > Basically, the appliance runs BackupPC on top of a special Ubuntu version
> > and will be very simple to configure. The draft announcement is available
> > on the project web page [0].
> >
> > Clearly QBA is covered by the GPL, based on its components such as Ubuntu
> > JeOS, SetACL and BackupPC. Proprietary tools such as vshadow.exe and
> > dosdev.exe (see below) are not necessary for QBA to work, but the user has
> > the choice to obtain those tools separately from Microsoft and enhance
> > QBA$,1rys functionality significantly.
> >
> > In addition to the above ease-of-use, QBA addresses some limitations stated
> > in the BackupPC FAQ:
> >
> > * "Non-Unix file attributes not backed up"
> > QBA uses SetACL [1] to backup and restore Windows NTFS access control lists
> > for every file and directory. The ACLs are stored for every directory
> > before the backup starts in a special file called BUGBUG, and upon restore
> > that data is used to recreate the ACLs for the restored files only. In
> > addition, QBA uses attrib.exe (part of every Windows installation) to
> > backup and restore other file attributes such as System, Hidden, Archive or
> > Read-Only.
>
> It seems to me that the right way to do this is still to modify
> BackupPC to capture the acl's from rsync and place them in the
> standard attrib file structure -- just need to add keys for the new
> acl attributes. This would avoid the need for a special pre-processing
> acl step (along with synchronization issues if files change between
> the pre-processing step and the backup) and also would avoid the need
> for a new shadow directory hierarchy set up just to store acl's. Also,
> since it comes for free with rsync, it doesn't add any real time to
> the backup vs. the need to crawl the entire directory tree to copy out
> acls. Plus rsync, automatically, would only save changes.
>
> I don't know about the other attributes, but rsync talks about being
> able to pass extended attributes. If they can be passed too, they
> should also be able to be integrated into the standard attrib file and
> again save unnecessary pre-processing and storage hierarchies.
>
> >
> > * "Locked files are not backed up"
> > QBA can make use of the Volume Shadow Copy Service that was introduced with
> > Windows XP to copy even open files such as Outlook .PSTs mail stores. In
> > order for this to work, the user has to provide his own copies of
> > vshadow.exe (part of the Volume Shadow Copy Service SDK) and dosdev.exe
> > (part of Microsoft Product Support's Reporting Tools), both of which are
> > free downloads. Once these files have been obtained by the user and
> > integrated via the available automated GUI process, QBA will use them
> > without further configuration to copy locked files. At the moment, there is
> > no GUI and the files have to be simply dropped into the correct folder of
> > the virtual $,1r|configuration$,1r} HD.
>
> Again this can be done with BackupPC.
>
> >
> > * "Don't expect to reconstruct a complete WinXX drive"
> > Since QBA addresses both the ACL and locked files issue, it remains to be
> > confirmed whether this is sufficient to reconstruct a complete Windows
> > drive. We anticipate that at least master boot record, partition table,
> > boot sector and boot loader need more investigation, but could potentially
> > be solved via the dd tool, as outlined here [2].
> >
>
> Yes. But this should be easy with dd and actually is independent of
> the above since all the above occurs at the partition level. Also, on
> restore you would of course have to marry some version of
> fdisk/gparted with mkntfs to recreate the partitions and
> filesystems.
>
> What I am not sure about is whether there is any other "magic" hiding
> in the ntfs filesystem that would need to be recovered to give a full
> restore.
>
as far as i know, there are so called streams, which allow to store file
metadata in the filesystem
> > Perhaps we could pool our interest in backing up ACLs and the registry (and
> > potentially the MBR) for a full Windows Disaster Recovery option in
> > BackupPC?
> >
>
> I applaud your efforts and it sounds interesting.
> However, it seems to me that at least 90% of what you are trying to do
> really should be done as an extension to BackupPC rather than as an
> add-on kludge. The key thing seems to be adding the ability to backup
> Windows acls and extended attributes -- to do that we don't need a new
> set of programs but rather some relatively straightforward extensions
> to BackupPC. In fact, I am surprised that people have not yet done
> this.
>
> If you focus on getting BackupPC to do the above, then it should be
> easy to add on your own additional wrapper to do whatever additional
> you need to do. This would include backing up the partition table and
> MBR which IMHO belongs outside of BackupPC since BackupPC really most
> naturally acts at the file level.
>
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