add fact backuppc_hosts which lists configured hosts
diff --git a/lib/facter/backuppc_hosts.rb b/lib/facter/backuppc_hosts.rb
new file mode 100644
index 0000000..44db8ac
--- /dev/null
+++ b/lib/facter/backuppc_hosts.rb
@@ -0,0 +1,10 @@
+Facter.add('backuppc_hosts') do
+  setcode do
+    if File.exists?('/etc/backuppc/hosts')
+      data = File.open('/etc/backuppc/hosts').read.split(/\n/)
+      data.shift
+
+      data.map {|it| it.split(' ')[0] }
+    end
+  end
+end
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