On the Exalytics Machine, you perform backup and recovery both for Oracle Business Intelligence and Oracle TimesTen, as described in the following list:
Backup and recovery for Oracle Business Intelligence is described in "Backup and Recovery Recommendations for Oracle Business Intelligence" in Oracle Fusion Middleware Administrator's Guide..
Backup and recovery for Oracle TimesTen is described in "Backing up and restoring a database" in Oracle TimesTen In-Memory Database Installation Guide.
In addition, if data was updated since the last backup, then run the aggregate scripts again after recovering the data. For information, see "Using Oracle BI Summary Advisor to Identify Query Candidates for Aggregation" in Metadata Repository Builder's Guide for Oracle Business Intelligence Enterprise Edition.