Documentation to configure the backup using S3, Azure, Minio
The C8 server will be connector to a storage to save the backup file. The storage maybe on Azure, S3, Google, Minio.
The procedure to connect on each storage are
The documentation on the backup is https://docs.camunda.io/docs/8.5/self-managed/operational-guides/backup-restore/backup-and-restore/
Check the Backup procedure
The restore is complex, because it's not only based on REST API. Zeebe has a specific tool to restore the data. Check the Restoration procedure