How is data duplication between NAS devices carried out?

Data duplication between NAS devices is usually achieved through replication and synchronization mechanisms. The main methods are:

• File system level replication: NAS devices periodically copy changes in files and directories to another device. This can be one-way or two-way replication.
• Synchronization via protocols: Protocols like rsync are used, which compare contents and transfer only changed data.
• Snapshots and their copying: Instantaneous data snapshots are created, which are then transferred to another NAS for backup.

Example: on two NAS devices supporting rsync, a cron job can be set up to regularly synchronize directories between the devices, ensuring data relevance and duplication.