Add backup job

Change-Id: I20a0babfac6e28010afb9d56184fa773d86b3254
diff --git a/jobs/project.yaml b/jobs/project.yaml
index fcef52f..31ca31a 100644
--- a/jobs/project.yaml
+++ b/jobs/project.yaml
@@ -54,6 +54,8 @@
       # - mark-reports - can't moved to JJB, a lot of parameters is not supported like Inject environment variables
       # - diff_params_reclass_system - can't moved to JJB, unsupported parameters
       # - diff_params_reclass_system - can't moved to JJB, unsupported parameters
+      - self-backup-jenkins-files:
+          trigger_time: H H * * 0
       - self-deploy-jobs
       - self-deploy-virtualenvs
       - cleanup-jenkins-agents