SIRIS, ALTO and NAS: Failed screenshot with screen showing "(file) is missing or corrupt" or "BOOTMGR is missing"

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Issue

This article describes the cause, and possible solutions for the screenshot verification errors, "(file) is missing or corrupt," or, "BOOTMGR is missing."

Environment

  • Datto SIRIS
  • Datto ALTO

Cause

These errors can have multiple causes, You may need to run a differential merge backup to reconcile the current backup with a new full scan of the target machine.

Figure 1: BOOTMGR is missing error 

Figure 2: BOOTMGR is missing or corrupt error 

Resolution

Manually force a differential merge for the agent.  Running a differential merge forces the agent to check the entirety of each volume being backed up. A differential merge takes as long to run as a full backup, but only uses the storage space of a normal incremental backup. diffmerge.png

 Figure 3: Force a Differential Merge


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