SIRIS, ALTO, and NAS: Datto Mac Agent: Critical backup failure: CURL Error: [URL]: 400



This article explains the origin of and solution for the Datto Mac Agent error: Critical backup failure: CURL Error: up: 400


  • Datto Mac Agent


This problem is caused by a conflict between the Datto Mac Agent and Apple FileVault.


To have successful backups with the Datto Mac Agent, you must disable Apple FileVault. See this article from Apple: OS X Yosemite: Turn off FileVault encryption (external link).

If you have already performed this step, contact Datto Technical Support for further assistance.


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