updated backup to use role.

tasks/main.yml

diff --git a/tasks/main.yml b/tasks/main.yml
index d70d809..55faf08 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -2,6 +2,7 @@
 # tasks file for opdk-backup
 - name: Stop component
   shell: '{{ apigee_service }} {{ component_profile }} stop'
+  when: component_profile != 'apigee-postgresql'
 
 - name: Backup component
   shell: '{{ apigee_service }} {{ component_profile }} backup'