I recently sat down with Gary Sussman, Principal Consultant, Technical Sales, to talk about the transport methods of Arcserve UDP agentless backup appliance. Gary has over 20 years of experience in the Data Protection and Business Continuity filed. Currently he provides technical presales consulting for the NA Partner community and Channel communities.

1. Can you please give us a little background on “Arcserve UDP?”

Arcserve UDP solution is fast and simple when it comes to virtual server backup software. It can provide agentless backup for VMware and Hyper-V host environments including:

  • Enables single-pass server backup software of all VMs, without the need to install software agents
  • Only backs up changed blocks
  • Integrates with Hyper-V & VMware API’s (For VM discovery, events, vStorage etc.)
  • Supports VMware vSphere (VSAN) Hyper-V Server 2012 & 2012 R2 (CSV)
  • Application consistent Backup (Exchange, SQL, AD etc.) & transaction-log purge
  • Easily recover individual files & folders from within each VM
  • Centralized node, group & plan management from UDP Console


2. Does UDP have Agentless Virtual Server Protection?

Arcserve UDP delivers a comprehensive server backup software for either virtual or physical environments.

For virtual hypervisors, UDP can offer Host-Based/Agentless Backups. This enables single-pass backup of all Windows and Non-Windows VMs, without the need to install software agents on each VM.

In addition, Arcserve UDP leverages VSS snapshot technology to help ensure file system and application consistent backups. You can also restore to the original or different hypervisor as well as granular file and Exchange mailbox level.


3. Can you please explain the agentless Backup Transport Method?

With VMware, Arcserve UDP supports a few backup transport methods. Using their VDDK api, VMware has developed back-ends that enable efficient access to data stored on ESX/ESXi servers. It is very important to note that this only works with the paid version of the software. Arcserve can access these data paths (called advanced transports) through the virtual disk library.

Depending on the environment these transport methods provide valuable options depending on the protected storage and network.

Arcserve UDP supports 3 transport methods discussed below: LAN (NBD), SAN, and HotAdd.


In update 2 you can provide method priorities with the server backup software and more features are due with update 3 – coming soon!

NBD (network block device) or NBDSSL (encrypted)

  • In this mode, the ESX/ESXi host reads data from storage and sends it across a network to the backup server.

SAN Transport

  • In this mode, the virtual disk library obtains information from an ESX/ESXi host about the layout of VMFS LUNs, and using this information, reads data directly from the SAN or iSCSI LUN where a virtual disk resides. This is a fast transport method for applications deployed on a SAN-connected ESX/ESXi host.


  • HotAdd automatically allows the protected virtual machines to be mounted on the backup proxy server. These virtual disks are seen by the proxy as a local disk.

Get more detailed information including advantages and disadvantages.

4. Is there anything more you would like to add about Arcserve UDP?

Arcserve UDP can adapt to any environment – physical or virtual. For virtual environments, it can utilize easy, agentless protection. With VMware, it can provide a comprehensive solution for many different types of environments. With UDP we can provide comprehensive protection and it includes several capabilities with a single unified management console. It will simplify the way you manage your data protection and disaster recovery.