Make etcd_backup_prefix configurable. Ensures that backups can be stored on a different location other than ${HOST}/var/backups, say an EBS volume on AWS.

inventory/group_vars/all.yml

@@ -4,6 +4,9 @@ bootstrap_os: none
 #Directory where etcd data stored
 etcd_data_dir: /var/lib/etcd
 
+#Directory where etcd backups are stored on the host
+etcd_backup_prefix: /var/backups
+
 # Directory where the binaries will be installed
 bin_dir: /usr/local/bin