Datto Endpoint Backup: Windows Agent Release Notes

This article contains all the software release notes for Datto Endpoint Backup. The latest updates appear first.

For more information about the Datto Endpoint Backup solution, see Getting Started with Datto Endpoint Backup.

Datto pushes updates out on a rolling basis. You may not be updated immediately upon each new release. Update windows will vary, but are generally completed within a few weeks of the initial release date.

Environment

  • Datto Endpoint Backup

Description

  • Releases consist of agent updates.
  • For information on cloud releases, review: Cloud Release Notes.
  • Datto pushes updates out on a rolling basis. You may not be updated immediately upon each new release. Update windows will vary, but are generally completed within one to two weeks of the initial release date.
  • When new releases become available, they are automatically pushed out and require no partner intervention unless otherwise noted.

Index

2024

Releases

Agent Version 3.0.33.0 - November, 10 2025

Bug Fixes

  • NTFS corruption root cause fixed Added mechanisms to fix scenario, in which after triggering differential merge as a first backup data corruption occurs.
  • Fix for sending wring IP address Mechanism of retrieving IP address that will be sent during checkin was completely refactored, to prevent sending IP address from already disconnected network adapter.
  • Backup Reliability Scenario in which backup was failing if system time was changed to past time (like during summer->winter time change) has been fixed.
  • Agent installer Datto Endpoint Backup installer recently had problem with installation on Windows Server 2012r2, and this issue has been resolved.

Agent Version 3.0.31.2 - June, 25 2025

Major Enhancements

  • Hash Cache Overhaul - Significantly reworked the agent’s Hash Cache system to minimize unnecessary data transfers, particularly during incremental backups. Improvements include:
    • Default block size reduced to 128KB (from 4MB)
    • Blake2B replaces SHA-256 for faster hashing
    • Hash size reduced to 16 bytes (from 32)
    • Parameters now configurable via agent.sqlite
    • Improved performance, smarter block comparison, and automatic cache rebuilding on config change

Improvements

  • Improved Backup Reliability and Diagnostics During Network Loss
  • Clearer error logging for lost connections
  • More reliable handling of failed writes during backup

Agent Version 3.0.28.2 - November 19, 2024

New Features

  • Automated Agent Service Recovery: Implemented a scheduled task to monitor and address agent service interruptions. The task automatically restarts the agent service or updates the agent as needed, improving stability and ensuring backups and autoupdates function reliably.

Agent Version 3.0.25.0 - October 16, 2024

New Features

  • HashCache Integration for Faster Diffmerge Operations: We’ve introduced HashCache to optimize diffmerge operations during backups. This enhancement reduces resource consumption, including CPU, Disk IO, and Network IO, by approximately 60%, significantly improving performance and reducing operation times.

Bug Fixes

  • Increased Backup Connection Timeout: Fixed the issue with the default Datto endpoint backup connection timeout being too short, causing potential failures in slower network environments. Now, the timeout has been increased to improve backup reliability.
  • DWA Uninstaller Removing Unrelated Files: Fixed the issue with the DWA uninstaller removing all contents within C:\\Program Files\\Datto, including unrelated files. Now, the uninstaller only removes Datto Windows Agent files, leaving other files intact.
  • Datto Endpoint Backup Agent Installation on Unsupported OS: Fixed the issue with the Datto endpoint backup agent allowing installation on non-supported operating systems, causing potential compatibility issues. Now, the agent correctly blocks installation on unsupported OSes to ensure proper functionality.
  • EB Agent Crashes: Fixed an issue with the EB Agent crashing, causing unexpected interruptions in backup processes. Now, the agent operates reliably without crashing during backups.

Agent Version 3.0.21.0 - July 22, 2024

Enhancements

  • Datto Windows Agent now collects more details about Disk health, NTFS and VSS logs; upcoming Siris and portal updates will alert for unhealthy local volumes.

Bug Fixes

  • Fix for occasionally hanging backups related to unstable network.
  • Fixed incorrect display of estimated backup completion time in the system tray.
  • Fixed an issue where backup progress could exceed 100% in the Datto portal, ensuring accurate progress display.

Agent Version 3.0.19.12 - June 26, 2024

Bug Fixes

  • Agent Interaction with "Partially Loaded" Driver: Fixed an issue where the agent failed to back up due to interacting with a "partially loaded" driver.

Agent Version 3.0.19.11 - June 7, 2024

Bug Fixes

  • Tracking During Pauses: Fixed a bug where changes made during pause states weren’t tracked. Our improved resumability implementation now captures and sends all new blocks, even during pauses, keeping backups up-to-date.

  • Fixed the issue with Memory Corruption in Empty Space Excluder: Resolved problem causing memory corruption due to undefined behavior during memory copying.

  • Fixed the issue with Improper Reading of Resume File with Byte Value 26: Corrected file reading mode to prevent premature end-of-file (EOF) when encountering byte value 26 in the resume file.

Agent Version 3.0.19.9 - June 4, 2024

NOTE  A manual agent update will need to be performed, before the automatic agent update process will resume. For more information please refer to: Manual Update Required for Datto Windows Agents

Bug Fixes

  • Snapshot Handling: Fixed an issue causing missed file system changes and corrupted backups due to simultaneous creation of shadow copies by other software. Our agent now handles these situations better, ensuring reliable backups.