Alright - I solved it using LVM.

Now I've got another question: Is it possible to run multiple backups at the 
same time?

This is my bacula-sd.conf at the moment:


> 
> #
> # Default Bacula Storage Daemon Configuration file
> #
> #  For Bacula release 5.2.6 (21 February 2012) -- debian jessie/sid
> #
> # You may need to change the name of your tape drive
> #   on the "Archive Device" directive in the Device
> #   resource.  If you change the Name and/or the 
> #   "Media Type" in the Device resource, please ensure
> #   that dird.conf has corresponding changes.
> #
> 
> Storage {                             # definition of myself
>   Name = archiv-sd
>   SDPort = 9103                  # Director's port      
>   WorkingDirectory = "/var/lib/bacula"
>   Pid Directory = "/var/run/bacula"
>   Maximum Concurrent Jobs = 20
>   #SDAddress = 127.0.0.1
>   SDAddress = archiv.myserver.com
> }
> 
> #
> # List Directors who are permitted to contact Storage daemon
> #
> Director {
>   Name = archiv-dir
>   Password = "U3fAurzWQLQa-yiNtt_ncXIcopObxuDPw"
> }
> 
> #
> # Restricted Director, used by tray-monitor to get the
> #   status of the storage daemon
> #
> Director {
>   Name = archiv-mon
>   Password = "5JE0u-IcgQrViQG_MDv6BzmNFS_UZF3CM"
>   Monitor = yes
> }
> 
> #
> # 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 = FileStorage
>   Media Type = File
>   Archive Device = /bacula/backup
>   LabelMedia = yes;                   # lets Bacula label unlabeled media
>   Random Access = Yes;
>   AutomaticMount = yes;               # when device opened, read it
>   RemovableMedia = no;
>   AlwaysOpen = no;
> }
> 
> #
> # An autochanger device with two drives
> #
> #Autochanger {
> #  Name = Autochanger
> #  Device = Drive-1
> #  Device = Drive-2
> #  Changer Command = "/etc/bacula/scripts/mtx-changer %c %o %S %a %d"
> #  Changer Device = /dev/sg0
> #}
> 
> #Device {
> #  Name = Drive-1                      #
> #  Drive Index = 0
> #  Media Type = DLT-8000
> #  Archive Device = /dev/nst0
> #  AutomaticMount = yes;               # when device opened, read it
> #  AlwaysOpen = yes;
> #  RemovableMedia = yes;
> #  RandomAccess = no;
> #  AutoChanger = yes
> #  #
> #  # Enable the Alert command only if you have the mtx package loaded
> #  # Note, apparently on some systems, tapeinfo resets the SCSI controller
> #  #  thus if you turn this on, make sure it does not reset your SCSI 
> #  #  controller.  I have never had any problems, and smartctl does
> #  #  not seem to cause such problems.
> #  #
> #  Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
> #  If you have smartctl, enable this, it has more info than tapeinfo 
> #  Alert Command = "sh -c 'smartctl -H -l error %c'"  
> #}
> 
> #Device {
> #  Name = Drive-2                      #
> #  Drive Index = 1
> #  Media Type = DLT-8000
> #  Archive Device = /dev/nst1
> #  AutomaticMount = yes;               # when device opened, read it
> #  AlwaysOpen = yes;
> #  RemovableMedia = yes;
> #  RandomAccess = no;
> #  AutoChanger = yes
> #  # Enable the Alert command only if you have the mtx package loaded
> #  Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
> #  If you have smartctl, enable this, it has more info than tapeinfo 
> #  Alert Command = "sh -c 'smartctl -H -l error %c'"  
> #}
> 
> #
> # A Linux or Solaris LTO-2 tape drive
> #
> #Device {
> #  Name = LTO-2
> #  Media Type = LTO-2
> #  Archive Device = /dev/nst0
> #  AutomaticMount = yes;               # when device opened, read it
> #  AlwaysOpen = yes;
> #  RemovableMedia = yes;
> #  RandomAccess = no;
> #  Maximum File Size = 3GB
> ## Changer Command = "/etc/bacula/scripts/mtx-changer %c %o %S %a %d"
> ## Changer Device = /dev/sg0
> ## AutoChanger = yes
> #  # Enable the Alert command only if you have the mtx package loaded
> ## Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
> ## If you have smartctl, enable this, it has more info than tapeinfo 
> ## Alert Command = "sh -c 'smartctl -H -l error %c'"  
> #}
> 
> #
> # A Linux or Solaris LTO-3 tape drive
> #
> #Device {
> #  Name = LTO-3
> #  Media Type = LTO-3
> #  Archive Device = /dev/nst0
> #  AutomaticMount = yes;               # when device opened, read it
> #  AlwaysOpen = yes;
> #  RemovableMedia = yes;
> #  RandomAccess = no;
> #  Maximum File Size = 4GB
> ## Changer Command = "/etc/bacula/scripts/mtx-changer %c %o %S %a %d"
> ## Changer Device = /dev/sg0
> ## AutoChanger = yes
> #  # Enable the Alert command only if you have the mtx package loaded
> ## Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
> ## If you have smartctl, enable this, it has more info than tapeinfo 
> ## Alert Command = "sh -c 'smartctl -H -l error %c'"  
> #}
> 
> #
> # A Linux or Solaris LTO-4 tape drive
> #
> #Device {
> #  Name = LTO-4
> #  Media Type = LTO-4
> #  Archive Device = /dev/nst0
> #  AutomaticMount = yes;               # when device opened, read it
> #  AlwaysOpen = yes;
> #  RemovableMedia = yes;
> #  RandomAccess = no;
> #  Maximum File Size = 5GB
> ## Changer Command = "/etc/bacula/scripts/mtx-changer %c %o %S %a %d"
> ## Changer Device = /dev/sg0
> ## AutoChanger = yes
> #  # Enable the Alert command only if you have the mtx package loaded
> ## Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
> ## If you have smartctl, enable this, it has more info than tapeinfo 
> ## Alert Command = "sh -c 'smartctl -H -l error %c'"  
> #}
> 
> 
> 
> 
> #
> # A FreeBSD tape drive
> #
> #Device {
> #  Name = DDS-4 
> #  Description = "DDS-4 for FreeBSD"
> #  Media Type = DDS-4
> #  Archive Device = /dev/nsa1
> #  AutomaticMount = yes;               # when device opened, read it
> #  AlwaysOpen = yes
> #  Offline On Unmount = no
> #  Hardware End of Medium = no
> #  BSF at EOM = yes
> #  Backward Space Record = no
> #  Fast Forward Space File = no
> #  TWO EOF = yes
> #  If you have smartctl, enable this, it has more info than tapeinfo 
> #  Alert Command = "sh -c 'smartctl -H -l error %c'"  
> #}
> 
> # 
> # Send all messages to the Director, 
> # mount messages also are sent to the email address
> #
> Messages {
>   Name = Standard
>   director = archiv-dir = all
> }
> 
> 


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