This article describes the cause, and possible solutions for the screenshot verification errors, "(file) is missing or corrupt," or, "BOOTMGR is missing."
- Datto SIRIS
- Datto ALTO
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
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.
Figure 3: Force a Differential Merge