docs: split faq into multiple files

docs/faq/backup.rst

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+Backup and restore
+------------------
+
+The service provides several commands aim to do easy repository backup and restore. If you would like to move repository from the server ``server1.example.com`` to another ``server2.example.com`` you have to perform the following steps:
+
+#. 
+   On the source server ``server1.example.com`` run ``repo-backup`` command, e.g.:
+
+   .. code-block:: shell
+
+      ahriman repo-backup /tmp/repo.tar.gz
+
+   This command will pack all configuration files together with database file into the archive specified as command line argument (i.e. ``/tmp/repo.tar.gz``). In addition it will also archive ``cache`` directory (the one which contains local clones used by e.g. local packages) and ``.gnupg`` of the ``ahriman`` user.
+
+#. 
+   Copy created archive from source server ``server1.example.com`` to target ``server2.example.com``.
+
+#. 
+   Install package as usual on the target server ``server2.example.com`` if you didn't yet.
+
+#. 
+   Extract archive e.g. by using subcommand:
+
+   .. code-block:: shell
+
+      ahriman repo-restore /tmp/repo.tar.gz
+
+   An additional argument ``-o``/``--output`` can be used to specify extraction root (``/`` by default).
+
+#. 
+   Rebuild repository:
+
+   .. code-block:: shell
+
+      sudo -u ahriman ahriman repo-rebuild --from-database