diff --git a/docs/epilog.rst b/docs/epilog.rst
index 307dc785..4fac62a8 100644
--- a/docs/epilog.rst
+++ b/docs/epilog.rst
@@ -11,8 +11,10 @@
 .. _LZ4: https://en.wikipedia.org/wiki/LZ4_(compression_algorithm)
 .. _Proxmox: https://www.proxmox.com
 .. _Proxmox Virtual Environment: https://www.proxmox.com/proxmox-ve
+.. _Proxmox Backup: https://www.proxmox.com/proxmox-backup
 .. _reStructuredText: https://www.sphinx-doc.org/en/master/usage/restructuredtext/index.html
 .. _Rust: https://www.rust-lang.org/
 .. _SHA-256: https://en.wikipedia.org/wiki/SHA-2
 .. _Sphinx: https://www.sphinx-doc.org
 .. _Virtual machine: https://en.wikipedia.org/wiki/Virtual_machine
+.. _APT: http://en.wikipedia.org/wiki/Advanced_Packaging_Tool
diff --git a/docs/installation.rst b/docs/installation.rst
index f5717cac..3aaab3a0 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -3,6 +3,8 @@ Installation
 
 sdfsd dfgfd dgd
 
+.. include:: package-repositories.rst
+
 This aasd safd
 --------------
 
diff --git a/docs/package-repositories.rst b/docs/package-repositories.rst
new file mode 100644
index 00000000..d11ff1b9
--- /dev/null
+++ b/docs/package-repositories.rst
@@ -0,0 +1,102 @@
+Debian Package Repositories
+---------------------------
+
+All Debian based systems use APT_ as package
+management tool. The list of repositories is defined in
+``/etc/apt/sources.list`` and ``.list`` files found inside
+``/etc/apt/sources.d/``. Updates can be installed directly using
+the ``apt`` command line tool, or via the GUI.
+
+APT_ ``sources.list`` files list one package repository per line, with
+the most preferred source listed first. Empty lines are ignored, and a
+``#`` character anywhere on a line marks the remainder of that line as a
+comment. The information available from the configured sources is
+acquired by ``apt update``.
+
+.. code-block:: sources.list
+  :caption: File: ``/etc/apt/sources.list``
+	   
+  deb http://ftp.debian.org/debian buster main contrib
+  deb http://ftp.debian.org/debian buster-updates main contrib
+
+  # security updates
+  deb http://security.debian.org/debian-security buster/updates main contrib
+
+  
+.. FIXME for 7.0: change security update suite to bullseye-security
+
+In addition, Proxmox provides three different package repositories for
+the backup server binaries.
+
+`Proxmox Backup`_ Enterprise Repository
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This is the default, stable and recommended repository, available for
+all `Proxmox Backup`_ subscription users. It contains the most stable packages,
+and is suitable for production use. The ``pbs-enterprise`` repository is
+enabled by default:
+
+.. code-block:: sources.list
+  :caption: File: ``/etc/apt/sources.list.d/pbs-enterprise.list``
+
+  deb https://enterprise.proxmox.com/debian/pbs buster pbs-enterprise
+
+
+As soon as updates are available, the superuser (``root@pam`` user) is
+notified via email about the available new packages. On the GUI, the
+change-log of each package can be viewed (if available), showing all
+details of the update. So you will never miss important security
+fixes.
+
+Please note that you need a valid subscription key to access this
+repository. We offer different support levels, and you can find further
+details at https://www.proxmox.com/en/proxmox-backup/pricing.
+
+.. note:: You can disable this repository by commenting out the above
+  line using a `#` (at the start of the line). This prevents error
+  messages if you do not have a subscription key. Please configure the
+  ``pbs-no-subscription`` repository in that case.
+
+
+`Proxmox Backup`_ No-Subscription Repository
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+As the name suggests, you do not need a subscription key to access
+this repository. It can be used for testing and non-production
+use. Its not recommended to run on production servers, as these
+packages are not always heavily tested and validated.
+
+We recommend to configure this repository in ``/etc/apt/sources.list``.
+
+.. code-block:: sources.list
+  :caption: File: ``/etc/apt/sources.list``
+
+  deb http://ftp.debian.org/debian buster main contrib
+  deb http://ftp.debian.org/debian buster-updates main contrib
+
+  # PBS pbs-no-subscription repository provided by proxmox.com,
+  # NOT recommended for production use
+  deb http://download.proxmox.com/debian/bps buster pbs-no-subscription
+
+  # security updates
+  deb http://security.debian.org/debian-security buster/updates main contrib
+
+
+`Proxmox Backup`_ Test Repository
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Finally, there is a repository called ``pbstest``. This one contains the
+latest packages and is heavily used by developers to test new
+features.
+
+.. warning:: the ``pbstest`` repository should (as the name implies)
+  only be used for testing new features or bug fixes.
+
+As usual, you can configure this using ``/etc/apt/sources.list`` by
+adding the following line:
+
+.. code-block:: sources.list
+  :caption: sources.list entry for ``pbstest``
+
+  deb http://download.proxmox.com/debian/bps buster pbstest
+