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As SQL Safe introduced new protocols, it 9.4 continues to use the WCF communication protocols introduced in 9.3. It is important to understand the impact on compatibility with older agent versions. This guide provides essential information to help you upgrade effectively.

• Incompatibility with older agents:
  
Previous agent versions
• Agents older than 9.3 (including 9.2.2 and lower) that do not include the new protocols are
no longer
• not supported in a mixed-version environment with SQL Safe 9.4.
• Backup processing:
  Previously, you could upgrade the Management Service while still using older agent versions. However, upgrading the Management Service to 9.4 will prevent communication with
those prior agent versions
• agents older than 9.3 (including 9.2.2 and lower), as they do not
use
• support the new protocols.
  These older agents will still process backups, but their statuses will not be reported to the Management Console.
  Agents 9.3 and 9.4 remain fully compatible with each other.
• Upgrade wizard:
  SQL Safe 9.4 provides a mass upgrade wizard to simplify the upgrade process for agents.
  
  

By following this guide, you can ensure a successful transition to the SQL Safe 9.4 version while minimizing potential disruptions.