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Druva Documentation

System requirements for NAS devices

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Software requirements for NAS devices

Druva provides vendor-agnostic support for NAS devices. The supported protocol for SMB and NAS shares is as mentioned below. Druva can perform backup and restore provided your configuration adheres to the following  NAS proxy mappings.

Share type on the NAS device NAS device is mapped to Shares discovered
NFS Linux NAS proxy NFS
CIFS/SMB and NFS Windows NAS proxy CIFS/SMB
CIFS/SMB and NFS Linux NAS proxy NFS
CIFS/SMB and NFS Windows NAS proxy and Linux NAS proxy CIFS/SMB and NFS


  • The NAS proxy must be version  4.8.16-98358 or later for share auto-discovery to work. 
  • Druva validates the NAS device credentials before adding the NAS device. Ensure that you have valid device credentials.
  • Druva supports Amazon FSx for Windows and Amazon EFS shares for backups and restores. You can protect Amazon FSx shares using a Windows proxy, and protect Amazon EFS shares using a Linux proxy.  For more information see Druva support for Amazon FSx for Windows and Amazon EFS
  • Druva supports Azure Files through SMB and NFS protocols via a NAS proxy. However, auto-discovery of shares is not supported as of now. For more information, see Add a NAS share.
  • Druva supports Nutanix Files through SMB and NFS protocols via a NAS proxy. For more information, see Add a NAS share.
  • Share discovery will not work if the NFS version on the NAS device is only v4.1 or NFS v4.2.
  • NAS proxy uses the showmount command to discover NFS shares. You'll need to install the required packages based on your operating system for this command to work.
    You must first check if the required package is installed, as follows:
    showmount -e <nas_device_ip>
    If the package is not included for <operating_system>, install the packages that include the command. For example, install nfs-common package for Ubuntu and nfs-utils for Linux.

Permissions for NAS share auto-discovery

The IPC$ share must be accessible with the provided device credentials. Druva accesses this share to authenticate itself with the NAS device, after which it can discover the other shares on the device.

Least privileges to protect SMB shares on NetApp

In scenarios where one user account does not have all the required privileges over all folders in the SMB share hierarchy on a NetApp filer, ensure that the user account you use at the NAS device level has the least privileges summarized below for successful backups and restores.

Job Use account type Privileges
Backups Domain user or domain admin user User account must be a member of the Backup Operators group on the NetApp filer.
Restores Domain user or domain admin user

User account must have write permissions over the target location. 

Note:If the user account lacks write permissions over the target location, Druva restores files with a .restored suffix at the target location. You need to rename these restored files by removing the suffix manually to complete the restore. The restore job ends with a Successful with Errors status.

Add this account to the credential store and assign it to the NAS shares. For more information, see Credentials in NAS share.

Software requirements for NAS proxy

Since you install the NAS proxy on a Windows or Linux server, the server must comply with the following requirements.

Operating System


Support Considerations


  • Windows Server 2022 (64-bit)
  • Windows Server 2019 (64-bit)
  • Windows Server 2016 R2 (64-bit) 
  • Windows Server 2012 R2 (64-bit) 
  • Windows Server 2008 R2 (64-bit) 

Druva supports backup and restore from all SMB share versions supported on the respective Windows Server version.


  • CentOS 7.x, 8.x, and 9.x (64-bit)
  • Ubuntu 16.x, 18.x, 20.x, and 22.x (64-bit)
  • Red Hat Enterprise Linux (RHEL) 7.x, 8.x, 9.x (64-bit)
  • Oracle Linux 6.x, 7.x, 8.x, and 9.x (64-bit)
  • SUSE Linux Enterprise Server (SLES) 12.x and 15.x (64-bit)
  • Amazon Linux 2

Druva supports backup and restore from all NFS share versions supported on the respective Linux Server version and variants.

Hardware requirements

The following table describes the hardware specifications that the Hybrid Workloads agent requires to run one backup or restore job at a time. By default, the Hybrid Workloads agent for NAS is configured to run six backup jobs in parallel.


Minimum Requirement


  • Three Cores (per job) or,
  • Three vCPUs if the agent is installed on a virtual machine (per job)


3 GB (per job)

Free space

  • On Windows and Linux servers, 2% of the total source data is utilized for the Druva application data. This application data is stored in the following locations:
    • Windows 2012 Server
    • Windows 2008 Server
    • Linux
      • /var/log/Phoenix
      • /var/Phoenix 

Supported Encoding

Druva supports valid UTF-8 encoded file names, filepaths, and share names.

Ports and communication protocols for Druva

Druva communicates with your NAS shares to back up and restore the data. This occurs through ports and protocols that are secure for communication and transition of data. Druva uses Transport Layer Security (TLS) protocol to establish a connection and initiate communication between Druva components and your NAS device.

The following diagram depicts the ports and communication protocols that Druva uses for secure connection and communication during the backup and restore operations. 


Firewall rules for data protection of NAS devices

If a firewall is configured in your environment, update the settings to allow the following patterns to gather telemetry data.