> > 3. Maintain a virtual fileysystem so all snapshots look like a single
> > backup volume to the user.
>
> Well - here it would probably help if you knew more about Bacula
> already :-)
>
> When doing a restore Bacula can present you with an overview of all
> the files backed up from a certain machine, so this is kind of like a
> virtual file system. This is presented to the user in the Bacula
> console program or the BAT gui. At the selecting stage of a restore,
> you don't have to know anything about volumes and what is stored
> where, so I guess your requirement is covered.
So, IOW, one selects a snapshot from, say, June 30, and Bacula
automatically restores the selected files which were on the machine that
day, is that correct?
> > 4. Maintain an easily monitored index so the user can see which drive
> > will be needed for a particular backup or restore operation.
>
> For restores, you get a list of needed volumes, and Bacula asks for a
> volume change or load if it's required.
How does Bacula identify each required disk to the user?
> There are several tools and procedures to achieve that. Note that
> Bacula does not write to raw disks, but creates regular files as
> volumes it uses, so you can use the OS tools like udev or automounter
> to get disks mounted when attached, which is what the above mentioned
> tools rely on.
So I take it the user must umount the drive before yanking it?
Bacula won't do it automatically? If so, this presents an interesting
failure mode. Say one intends to mount the drive to /Backup, but for some
reason the backup fails and the user is not aware of it. It sounds to me,
then, like Bacula might blissfully fill up the root drive, orphaning a chunk
of the backup stream in the process, and possibly even crashing the system.
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