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About adding backup storage to a UEB appliance

To add more backup storage to your UEB appliance, Unitrends recommends adding storage in the same manner as the initial backup storage:

If virtual attached disk storage was used, we recommend adding virtual disks to the UEB VM via the host and expanding the initial backup storage to include them. See Procedures for adding attached disk backup storage for details.
If a NAS share was attached to the host using NFS, we recommend adding another share in the same manner and expanding the initial backup storage to include the new VMDK or VHD(X) disks. See Procedures for adding attached disk backup storage for details.
If a SAN LUN was connected to the host, we recommend adding another LUN in the same manner and expanding the initial backup storage to include the new VMDK or VHD(X) disks. See Procedures for adding attached disk backup storage for details.
If a SAN or NAS was directly attached to the UEB appliance, expanding the initial backup storage is not supported. instead, LUNs or shares can be added to the appliance as separate storage areas. See Procedures for adding external storage for details.