KB5064080: Microsoft Launches Windows 11 Backup App and Additional Features in Latest Update

Microsoft Unveils August 2025 Optional Preview Update: Key Features and Improvements

On August 26, 2025, Microsoft released the optional preview update KB5064080 (build 22621.5840), known as the C release. This update marks a significant milestone as it introduces the Windows Backup app for Organizations, making it accessible not just to individual users but also to enterprise environments, facilitating smoother data management across various organizational setups.

New Features: Windows Backup for Organizations

One of the standout features in this update is the launch of the Windows Backup for Organizations. This enterprise-level solution provides a seamless experience for device transitions, whether your organization is refreshing its hardware, upgrading to Windows 11, or deploying advanced AI-enabled PCs. By ensuring minimal disruption, this backup system supports business continuity and enhances operational resilience.

Notable Fixes and Improvements

The August update also includes numerous bug fixes and enhancements aimed at improving system performance and user experience. Below is a summary of the key updates:

Improved Copilot: Enhanced the reliability of the Copilot key and resolved an issue that hindered restarting Copilot after activation.
Country and Operator Settings Asset (COSA): Updated profiles for specific mobile operators to enhance connectivity.
Device Management: Resolved an issue where removable storage policies failed to block unauthorized external devices like USB drives.
Family Safety: Fixed an issue that prevented the “Ask to Use” prompt from displaying when blocked apps were accessed, ensuring compliance with Family Safety settings.
File Explorer Issues:
- Fixed a problem where File Explorer would only display a single folder instead of recent files.
- Addressed performance lags when syncing more SharePoint sites, which affected navigation speed and file launching.
File Sharing Friction: Fixed delays experienced while accessing files on Server Message Block (SMB) shares over Quick UDP Internet Connections (QUIC).
File System Resiliency: Resolved a bug within the Resilient File System (ReFS) that could cause system hangs when deduplication and compression were enabled concurrently.
Input Enhancements:
- Corrected issues with displaying certain extended Unicode characters, ensuring compliance with GB18030-2022.
- Fixed character rendering problems associated with the Chinese (Simplified) Input Method Editor (IME).
Narrator Improvements: Adjusted Narrator to correctly read labels for the Enhance Facial Recognition Protection checkbox under Windows Hello settings.
Network Connectivity Fixes: Addressed an issue where Wi-Fi failed to automatically reconnect after a Group Policy update.
Remote Desktop Accessibility: Solution implemented for cameras not appearing in Remote Desktop sessions following their addition or removal.