RDS uses hot standby, so if a physical server fails, the service is switched over in seconds without interruptions to application services.
The data on the RDS server is stored on RAID, and backed up on OSS.
RDS provides an automatic backup mechanism. You can set a backup schedule or initiate a temporary backup at any time.
Data can be recovered from a backup. Generally, data can be recovered within 7 days to a temporary RDS instance. After the data is verified, the data can be migrated back to the master RDS instance.