# Backing up and restoring a CDB


You can back up and restore your CDB using either RDS DB snapshots or Recovery Manager (RMAN).

## Backing up and restoring a CDB using DB snapshots


DB snapshots work similarly in the CDB and non-CDB architectures. The principal differences are as follows:
+ When you restore a DB snapshot of a CDB, you can't rename the CDB. The CDB is named `RDSCDB` and can't be changed.
+ When you restore a DB snapshot of a CDB, you can't rename PDBs. You can modify the PDB name by using the [modify-tenant-database](https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_ModifyTenantDatabase.html) command.
+ To find tenant databases in a snapshot, use the CLI command [describe-db-snapshot-tenant-databases](https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_DescribeDBSnapshotTenantDatabases.html).
+ You can't directly interact with the tenant databases in a CDB snapshot that uses the multi-tenant architecture configuration. If you restore the DB snapshot, you restore all its tenant databases. 
+ RDS for Oracle implicitly copies tags on a tenant database to the tenant database in a DB snapshot. When you restore a tenant database, the tags appear in the restored database.
+ If you restore a DB snapshot and specify new tags using the `--tags` parameter, the new tags overwrite all existing tags.
+ If you take a DB snapshot of a CDB instance that has tags, and you specify `--copy-tags-to-snapshot`, RDS for Oracle copies tags from the tenant databases to the tenant databases in the snapshot.

For more information, see [Oracle Database considerations](USER_RestoreFromSnapshot.md#USER_RestoreFromSnapshot.Oracle).

## Backing up and restoring a CDB using RMAN


To learn how to back up and restore a CDB or individual tenant database using RMAN, see [Performing common RMAN tasks for Oracle DB instances](Appendix.Oracle.CommonDBATasks.RMAN.md).