SIRIS, ALTO, and NAS: Failed screenshot with "BOOTMGR is compressed"



Screenshots fail with the verification error, "BOOTMGR is compressed."


This is caused because NTFS compression has been enabled on the volume containing the Windows boot files.

When this option is selected, Windows will try to compress all files, including critical boot files.


Follow these steps when you see the following error:

Figure 1: BOOTMGR is compressed error

1. On the production machine, open Windows Explorer (explorer.exe)

2. Right-click the drive where BOOTMGR is located (typically C:), and select Properties.

3. Uncheck the Compress this drive to save disk space option.

4. Take a new backup, and then schedule a screenshot for the new backup.

Figure 2: BOOTMGR properties

5. If the "BOOTMGR is missing" message appears after a new backup, manually force a differential merge for the agent. This will force the agent to traverse the entirety of each volume being backed up, and it will appear to be a full backup. However, a diff-merge backup will only incur a cost of space on the storage array equal to a normal incremental and a minor amount of overhead.

Was this article helpful?

0 out of 0 found this helpful

You must sign in before voting on this article.

Want to talk about it? Have a feature request?

Head on over to our Datto Community Forum or the Datto Community Online.

For more Business Management resources, see the Datto RMM Online Help and the Autotask PSA Online Help .

Still have questions? Get live help.

Datto Homepage