Bacula virtual disk configuration, based on http://blog.bacula.org/whitepapers/CommunityDiskBackup.pdf

bacula-dir.conf

Director {
  Name = bacula-dir
  DIRport = 9101
  QueryFile = "/usr/local/share/bacula/query.sql"
  WorkingDirectory = "/usr/local/bacula/working"
  PidDirectory = "/var/run"
  
  # I use 7 because: 5 drives, + restore drive, plus bconsole & bacula-dir connections
  # read the docs for bacula-dir, bacula-fd, and bacula-sd about this.
  # My comments are vague here... sorry.
  #
  Maximum Concurrent Jobs = 7
  Password = "Right,MyPassword"
  Messages = Standard

  TLS Enable      = yes
  TLS Require     = no
  TLS Verify Peer = yes
  TLS Allowed CN  = "bacula.int.unixathome.org"
  TLS CA Certificate File = /usr/local/bacula/certificates/ca.crt

  TLS Certificate = /usr/local/bacula/certificates/client.crt
  TLS Key         = /usr/local/bacula/certificates/client.key
}


Storage {
  Name       = CreyFile
  Address    = crey.int.unixathome.org                # N.B. Use a fully qualified name here
  SDPort     = 9103
  Password   = "MySDPassWord"

  AutoChanger = Yes

  # this is the Device you want to specify.  Call it anything you want, but make sure it
  # matches the name of the Autochanger you want to use from bacula-sd.conf (around line 52).
  Device     = VirtualDisk
  Media Type = File

  Maximum Concurrent Jobs = 7
}


# for restoring
Storage {
  Name       = CreyFileRestore
  Address    = crey.int.unixathome.org                # N.B. Use a fully qualified name here
  SDPort     = 9103
  Password   = "MySDPassWord"

  Device     = Restore-Drive
  Media Type = File

  Maximum Concurrent Jobs = 2
}

bacula-fd.conf

Client {
  Name           = supernews-fd
  Address        = supernews.example.org
  FDPort         = 9102
  Catalog        = MyCatalog
  Password       = "TheFDPassword"

  # see http://www.bacula.org/7.4.x-manuals/en/main/Client_File_daemon_Configur.html
  # Maximum Concurrent Jobs = number
  # where number is the maximum number of Jobs that should run concurrently. 
  # The default is set to 2, but you may set it to a larger number. Each contact from the 
  # Director (e.g. status request, job start request) is considered as a Job, so if you want 
  # to be able to do a status request in the console at the same time as a Job is running, you 
  # will need to set this value greater than 1.

  Maximum Concurrent Jobs = 3

  TLS Require = yes
  TLS Enable  = yes
  TLS CA Certificate File = /usr/local/bacula/certificates/ca.crt

  TLS Certificate = /usr/local/bacula/certificates/client.crt
  TLS Key         = /usr/local/bacula/certificates/client.key

  File   Retention = 3 years
  Job    Retention = 3 years
}

bacula-sd.conf

Storage {                             # definition of myself
  Name = crey-sd
  WorkingDirectory = "/usr/local/bacula/working"
  Pid Directory = "/var/run"
  Maximum Concurrent Jobs = 20

  TLS Enable      = yes
  TLS Verify Peer = yes

  TLS CA Certificate File = /usr/local/etc/ssl/ca.pem

  TLS Certificate = /usr/local/etc/ssl/crey.int.unixathome.org.crt
  TLS Key         = /usr/local/etc/ssl/crey.int.unixathome.org.nopassword.key

}

#
# List Directors who are permitted to contact Storage daemon
#
Director {
  Name = bacula-dir
  Password = "MySDPassWord"
}

#
# Note, for a list of additional Device templates please
#  see the directory <bacula-source>/examples/devices
# Or follow the following link:
#  http://bacula.svn.sourceforge.net/viewvc/bacula/trunk/bacula/examples/devices/
#

#
# Devices supported by this Storage daemon
# To connect, the Director's bacula-dir.conf must have the
#  same Name and MediaType. 
#

Device {
  Name           = Restore-Drive
  Media Type     = File
  Archive Device = /usr/local/bacula/volumes
  LabelMedia     = yes
  Random Access  = yes
  AutomaticMount = yes
  RemovableMedia = no
  AlwaysOpen     = no

  Maximum Concurrent Jobs = 2
  Volume Poll Interval    = 15
}

Autochanger {
  Name = VirtualDisk

  Changer Device  = /dev/null
  Changer Command = /dev/null

  Device          = vDrive-0, vDrive-1, vDrive-2, vDrive-3, vDrive-4
}

Device {
  Name           = vDrive-0
  Media Type     = File
  Archive Device = /usr/local/bacula/volumes
  LabelMedia     = yes
  Random Access  = yes
  AutomaticMount = yes
  RemovableMedia = no
  AlwaysOpen     = no

  Autochanger    = yes
  Drive Index    = 0

  Maximum Concurrent Jobs = 1
  Volume Poll Interval    = 15
}

Device {
  Name           = vDrive-1
  Media Type     = File
  Archive Device = /usr/local/bacula/volumes
  LabelMedia     = yes
  Random Access  = yes
  AutomaticMount = yes
  RemovableMedia = no
  AlwaysOpen     = no

  Autochanger    = yes
  Drive Index    = 1

  Maximum Concurrent Jobs = 1
  Volume Poll Interval    = 15
}

Device {
  Name           = vDrive-2
  Media Type     = File
  Archive Device = /usr/local/bacula/volumes
  LabelMedia     = yes
  Random Access  = yes
  AutomaticMount = yes
  RemovableMedia = no
  AlwaysOpen     = no

  Autochanger    = yes
  Drive Index    = 2

  Maximum Concurrent Jobs = 1
  Volume Poll Interval    = 15
}

Device {
  Name           = vDrive-3
  Media Type     = File
  Archive Device = /usr/local/bacula/volumes
  LabelMedia     = yes
  Random Access  = yes
  AutomaticMount = yes
  RemovableMedia = no
  AlwaysOpen     = no

  Autochanger    = yes
  Drive Index    = 3

  Maximum Concurrent Jobs = 1
  Volume Poll Interval    = 15
}

Device {
  Name           = vDrive-4
  Media Type     = File
  Archive Device = /usr/local/bacula/volumes
  LabelMedia     = yes
  Random Access  = yes
  AutomaticMount = yes
  RemovableMedia = no
  AlwaysOpen     = no

  Autochanger    = yes
  Drive Index    = 4

  Maximum Concurrent Jobs = 25
  Volume Poll Interval    = 15
}

Messages {
  Name = Standard
  director = bacula-dir = all
}

JobDefs

I have this defined in all job defs.  Otherwise, a job might want to use a Volume already 
mounted and in use by an existing job. This directive tells it to use another Volume,
which would be mounted on another drive.

JobDefs {
  ...
  PreferMountedVolumes = no
  ...
}

Here's a full example:

JobDefs {
  Name        = "DefaultJob"
  Type        = Backup
  Level       = Incremental
  Schedule    = "WeeklyCycle"
  
  # note this is where I specify that SD
  Storage     = CreyFile
  Messages    = Standard

  Write Bootstrap = "/usr/local/bacula/bsr/%c_%n.bsr"

  Pool        = FullFile  # required parameter for all Jobs

  # don't get hung up on these bits...
  Full         Backup Pool = FullFile
  Differential Backup Pool = DiffFile
  Incremental  Backup Pool = IncrFile

  Priority    = 10

  # don't spool date when backing up to disk
  Spool Data  = no
  Spool Attributes = yes

  # this is the important part
  PreferMountedVolumes = no
}

notes

These are exerpts from my configuration files.  They are not complete.

This should get you started.