For a production system, the Best Practice is to schedule daily backups with retention set to seven days. This insures that you can revert the system to a working state that is as much as a week old.
Also, we recommend pausing data ingestion while the snapshot is being taken.
For more information about backing up your Solr deployment, see Solr Deployment Backups. SearchStax offers a Backup/Restore API. If your backups are not successful, see Why do backups fail?