Index Cluster - Backup stratetegy

Hi All, We have 3 indexers in a Index cluster with a Index master. Currently, the data is being backed up periodically to AWS S3/Glacier storage. We want to understand if we need to shutdown before we backup the buckets Reviewed this [http://docs.splunk.com/Documentation/Splunk/6.5.0/Indexer/Backupindexeddata][1] [1]: http://docs.splunk.com/Documentation/Splunk/6.5.0/Indexer/Backupindexeddata