SIRIS, ALTO, and NAS: Advanced Backup Verification: Local Verified



This article discusses the Local Verified feature for Datto business continuity appliances.


  • Datto SIRIS
  • Datto ALTO


The Local Verified feature measures the health of a backup snapshot at the file level to ensure data integrity, and to allow you to make informed decisions about which recovery points to restore from in the event of a disaster.

Configuring Local Verification

To enable or disable this feature, perform the following steps:

1. Access the GUI of your Datto appliance, and click the Protect tab.

2. Click the Configure Agent Settings link next to the protected system on which you would like to set up the feature.

3. Scroll down to the Local Verification section of the Configure Agent Settings page, as shown in Figure 1.

mceclip0.pngFigure 1: Local Verification (click to enlarge)

Checks Performed & Interpreting Results

When enabled, your Datto appliance will run the following validations during the backup process and report the following results:

Integrity Verification

  • Filesystem Check: Checks for critical filesystem errors in the snapshot which could affect its usability. If the snapshot fails the filesystem check, the Datto appliance reports the reason for failure.

    Filesystem errors typically replicate from the production machine. If you receive a filesystem integrity alert, Datto recommends the following troubleshooting steps:

  1. Run another backup. If the integrity check continues to fail, proceed to step 2.
  2. Run a read-only chkdsk on the affected server. Address any issues the chkdsk finds. If the chkdsk finds no issues and the integrity check still fails, proceed to step 3.
  3. Run a chkdsk /f /r on the affected server (a server reboot will be required). Address any issues the chkdsk /f /r finds.
  4. Run another backup. If the integrity check still fails, force a differential merge on the next backup.

If you continue to receive failure alerts after performing the above steps, contact Datto Technical Support.

  • Volume CheckThe Datto appliance will check that the volumes which were captured in the backup match those included for backup in the Volume-Level Backup Control interface. The Datto appliance will alert you if a volume is missing.
  • VSS Check: This check looks for  VSS writer failures on the production machine during the backup process, which causes the agent to fall back to the crash-consistent STC or DBD backup engine to capture a snapshot successfully. This check will only occur if you have configured the agent to use a fallback engine.

Ransomware Detection

  • Ransomware Check: The Datto appliance will check the snapshot for signs of ransomware, and alert you if an infection is suspected. See the Ransomware Detection 101 article for more information.

The device GUI reports the results of these checks in the Local Verified column of the Manage Recovery Points page.

mceclip1.pngFigure 2: Verification icons and their meanings

Mousing over the icons in the Datto appliance interface will display a detailed backup report for each snapshot.

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