Thecus N8900 series User Manual page 192

The local backup has 6 different selection you can choose from.
Local Data backup
Item
Import
Copy
Realtime Backup
Schedule Backup
iSCSI Backup
iSCSI Import
Description
This is associated with external devices which are added to the
system such as USB disk. You can select a folder from an external
device and import it to the NAS as a share folder.
Copy folder to folder or NAS folder to external device or external
device to NAS folder. This backup is within folder level.
The task will be executed on the fly between the source and the
target. In other word, any changes made at the source will sync to
the destination immediately.
The task will be executed on schedule between the source and the
target.
The iSCSI volume will be backup to the destination as a single file.
The iSCSI file can be imported from the iSCSI backup back to the
destination as an iSCSI volume.
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