Acronis True Image 2017: Backup to Acronis Secure Zone Fails with "Error occurred while opening the file"

Symptoms

1. You try to save a backup to Acronis Secure Zone (ASZ).
2. Backup fails with error:
   Error occurred while opening the file

Cause

Issue in the product.

Solution

The issue is expected to be resolved in Hotfix 1 for Acronis True Image 2017. Make sure to enable automatic check for updates at program startup so that you do not miss it when it becomes available: