All backups above Level 0 Full backups are running very slow compared to the Level 0 Fulls
Issue is caused to incompatibility with the version of the Hitachi NAS OS - BlueArc.
The NetVault NDMP Plugin is only supported up to BlueArc 10.0.x (BOS 10.0.x)
The NetVault NDMP Plugin is not yet certified with BlueArc 11.x or 12.x
Ref: NetVault Backup Compatibility Guide
https://support.quest.com/search?k=netvault+Compatibility+Guide
Workaround:
Downgrade to the supported version of BlueArc.
