Thank you @L_BR for your quick answer
Yes, i have registred the vCenter in Netbackup using a user with the following permissions
Cryptographics Operations
Direct Access
Encrypt New
Migrate
Datastore
Allocate space
Browse datastore
Configure datastore
Low level file operations
Update virtual machine files
Update virtual machine metadata
Global
Cancel task
Disable methods
Enable methods
Global tag
Licenses
Log event
Manage custom attributes
Set custom attribute
Settings
Host
Configuration
Advanced settings
Storage partition configuration
Network
Assign network
Resource
Assign vApp to resouce pool
Assign virtual machine to resource pool
Tasks
Create task
Update task
vApp
Add virtual machine
Assign resource pool
Assign vApp
Create
Virtual Machine
Change Configuration
Acquire Disk Lease
Add existing disk
Add new disk
Advanced
Add or remove device
Change Settings
Change Swapfile placement
Change resource
Configure Raw device
Modify device settings
Remove disk
Set annotation
Toggle Disk Change Tracking
Edit Inventory
Create from existing
Create New
Register
Remove
Unregister
Interaction
Power Off
Power On
Provisioning
Allow disk access
All read-only disk access
Allow virtual machine download
Snapshot management
Create snapshot
Remove Snapshot
Revert to snapshot
vSphere Tagging
Assign or Unassign vSphere Tag
When using the NetBackup Plugin for vCenter the following privileges can be added:
NetBackup Recovery
Add or Remove NetBackup Servers
Virtual Machine Recovery
the following credentials are added:
Virtual Machine
Guest Operations
Guest operation queries
Guest operation modifications
Guest operation program execution
Virtual Machine
Change Configuration
Remove disk
