The API changed slightly.

playbooks/roles/go-server/tasks/main.yml

@@ -173,3 +173,5 @@
 
 - include: setup_regular_backup.yml
   when: GO_SERVER_BACKUP_S3_BUCKET and GO_SERVER_BACKUP_S3_OBJECT and GO_SERVER_CONFIGURE_BACKUPS
+  tags:
+    - setup_backups

playbooks/roles/go-server/templates/gocd_backup.j2

@@ -40,6 +40,7 @@ backup_path=\
 $(curl -sS "$gocd_backup_api_call" \
     -u "$gocd_username:$gocd_password" \
     -H 'Accept: application/vnd.go.cd.v1+json' \
+    -H 'Confirm: true' \
     -X POST | \
 jq .path | tr -d '"')