# System Requirements for Windows Block-Level Backups

Verify that your environment meets the system requirements for block-level backup for Windows.

## Operating System

Important

Use the most recent version of the operating system that is listed. The Commvault software fully supports the most recent version of an operating system, until the vendor ends support. More recent versions of the Commvault software might not install on operating systems that are not supported by the vendor anymore. For information about the support lifecycle of an operating system, contact the vendor.

Operating system | Processor architecture
--- | ---
Microsoft Windows Server 2022 Editions | All Windows-compatible processors are supported
Microsoft Windows Server 2019 Editions | All Windows-compatible processors are supported
Microsoft Windows Client 10 Editions | All Windows-compatible processors are supported
Microsoft Windows Client 8.1 For more information, see Considerations for Microsoft Windows Server 2012, 2012 R2, and Windows 8. | All Windows-compatible processors are supported
Microsoft Windows Server 2016 Editions | All Windows-compatible processors are supported

## Hard Drive

Component | Space required
--- | ---
Software | 1 GB
Job results folder | 500 MB 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.
Log folder | 500 MB

## Hard Drive Sector Sizes

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

Software That Is Automatically Installed

### .NET Framework

On most versions of Windows, the .NET Framework 4.7 is automatically installed.

### Microsoft Visual C++ Redistributable 2017

Starting with Service Pack 18, Microsoft Visual C++ Redistributable 2017 (vcredist2017.exe) is automatically installed.

If a computer does not have the most recent 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. The updates are not required on the most recent Windows operating system versions, such as Microsoft Windows 10 and Microsoft Windows Server 2016, because these versions have the Universal C Runtime already installed.

- KB2919355

- KB2939087

- KB2975061

- KB2999226

## File Systems

The following file systems are supported:

- New Technology File Systems (NTFS)

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

## 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.

## DISCLAIMER

Certain third-party software and service releases (together, "Releases") may not be supported by Commvault. You are solely responsible for ensuring Commvault’s products and services are compatible with any such Releases.

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