Duple Backup was not officially released prior to TOS 5, as it remained in the development and testing phase. TOS 5 thus features the redesigned Duple Backup with an optimized user interface, additional features, and improved user experience.
All New Features(PDF)
/ Duple Backup
Duple Backup offers powerful backup and restore functions, being a disaster recovery tool designed to strengthen the data security of TNAS devices. To prevent data loss due to TNAS device hardware failure or system failure, Duple Backup's intuitive user menu allows users to back up important folders or iSCSI LUNs in the TNAS to multiple destinations such as remote TNAS devices, file servers, or cloud disks. It supports multiple backup strategies, including incremental backup and multi-version backup. The backup and restore process is very simple and intuitive, and lost data can be rapidly restored in the event of device failure.