Block-Level Backup for Windows: System Requirements

The following are the requirements for block-level backup for Windows.

Operating System

Microsoft Windows Server 2019 (Standard, Datacenter) (64-bit only)

Microsoft Windows Server 2019 Editions

Windows 10

Microsoft Windows Client 10 Editions

Windows 8

Microsoft Windows Client 8

Microsoft Windows Client 8.1

For more information, see Considerations for Microsoft Windows Server 2012, 2012 R2, and Windows 8.

Windows Server 2016

Microsoft Windows Server 2016 Editions

Windows Server 2012

Microsoft Windows Server 2012 Editions

Microsoft Windows Server 2012 R2 Editions

Windows Server 2008

Microsoft Windows Server 2008 R2 Editions

Hard Drive

1 GB minimum of hard disk space for installing the software.

500 MB of free disk space is required for job result directory. The cluster size of the backup volume must be equal to the volume of the Job Results directory. If the live browse volume is more than 16TB, and your cluster size is 4096 bytes, then the live browse operation fails.

Some agents and components require additional disk space, see Agents and Components Requiring Additional Disk Space.

500 MB of free disk space is required for log directory.


All Windows-compatible processors are supported.


.NET Framework

.NET Framework 4.0 is automatically installed. Note that .NET Framework 4.0 can co-exist with other versions of this software.

Microsoft Visual C++ Redistributable 2017 is Automatically Installed

Starting in Service Pack 18, Microsoft Visual C++ Redistributable 2017 (vcredist2017.exe) is automatically installed. If a computer does not have the latest Windows updates, the installation of Microsoft Visual C++ Redistributable 2017 will fail in installing Universal C Runtime.

The following Windows updates must be installed to prevent the installation failure:





Updates are not required on latest Windows operating system versions, such as Microsoft Windows 10 and Microsoft Windows Server 2016, as these versions come with the Universal C Runtime already installed.

Microsoft Visual C++ 2013 Redistributable Package

Microsoft Visual C++ 2017 Redistributable Package

For Windows 2008 R2 computers, use a minimum of Service Pack 1.

Supported File Systems

The following file systems are supported:

  • New Technology File Systems (NTFS)

  • Resilient File System (ReFS) on Windows Server 2016 computers.

Supported Drivers

The following drivers are supported:

  • QSnap Driver is supported on Windows Server 2003 and later.

  • CvvD (Commvault Virtual Disk Controller) Driver is supported on Windows 2008 R2 and later.

Supported Sector Size for Hard Drives

Hard disks with sector sizes of 512 bytes are supported for performing block-level backups. Hard disks with sector sizes larger than 512 bytes are not supported.


Third-party maintenance (minor) releases or service packs that are supported by the Commvault software may not be listed in our System Requirements. When possible, Commvault provides information on any known issues related to these minor releases or service packs. In some cases, these minor releases or service packs affect how the Commvault software works. Commvault software may experience changes in functionality as the result of the third-party minor release or service pack. These changes are beyond the control of Commvault. Platforms that are supported in the current version of Commvault software may not be supported in earlier versions of the software. Contact your software provider to ensure that third-party minor releases or service packs are compatible with the Commvault software. Additional considerations regarding minimum requirements and End-of-Life policies from third-party vendors also apply.