You can use the Commvault software to protect DynamoDB tables across multiple accounts and regions. Commvault integrates with the DynamoDB data access APIs for full and incremental backups.
Key Features
Single interface to manage DynamoDB tables from multiple AWS accounts
Granular backup of tables, or a complete region, or multiple regions
Protect tables based on Amazon Web Services tags and rules for table names
Automatic failover of an access node during backup and restore operations when the primary access node is not accessible
Ability to change the access node for full and incremental backups
Restore an individual table, multiple tables, or all tables in a region
Restore to a different cloud account
Restore to different regions and with a different table name