Backing up Exadata Storage Server Software is critical for restoration.

Backup of the Oracle Cluster Registry, which also contains Voting Disk information, is automatically maintained on the file system of the first database server.

For high availability, system area can be on the first two disks and M.2 devices.

Use a snapshot-based backup of an Oracle Exadata Database Machine database server software.

The M.2 disk is hot pluggable and can be replaced when the power is on, but you will have to restore the system data manually.