SIRIS, ALTO, and NAS: Disaster Recovery: Performing A Restore From A Rescue Agent



This article describes how to restore from a Rescue Agent for Datto appliances capable of running local virtualizations. The steps described assume that you have already started a Rescue Agent as described in this article.


  • Datto SIRIS


In the event of a disaster recovery scenario when running off of a Rescue Agent, you will need to perform a restore once the host environment has returned to production.  The Rescue Agent takes ZFS snapshots of the disk in its current state, which means that any data in memory will not flush to disk. To ensure that everything in memory is preserved in a snapshot, power off the VM from the Protect tab before taking a manual snapshot.

The Rescue Agent will need to be powered off during the duration of the restore. Please ensure to schedule downtime before performing this restore.


1. Navigate to the Restore tab, then click Manage Rescue Agent on the agent you are ready to restore.

mceclip0.pngFigure 1: Restore → Manage Rescue Agent (click to enlarge)

2. Open the browser VNC session and perform a soft shutdown of the VM (From Windows: Start Menu > Shutdown).

Do not click the STOP button as this is the equivalent of pulling the power cord from a server.

mceclip1.pngFigure 2: Opening the browser VNC session (click to enlarge)

3. Wait for the VM to shut down completely.  The VM Status section will look like this:

mceclip2.pngFigure 3: Stopped VM (click to enlarge)

Datto strongly recommends waiting until the restore, and a good backup of the agent have completed before archiving the rescue agent.

4. Navigate to the Protect Tab and click the Start A Snapshot button for the Rescue Agent

mceclip3.pngFigure 4: Start a snapshot (click to enlarge)

5. The snapshot time will update to the current date/time

mceclip5.pngFigure 5: Last successful snapshot (click to enlarge)

6. Navigate to the Restore Tab and perform the Recovery Type needed.  See this section

mceclip6.pngFigure 6: Choose a Recovery Type (click to enlarge)

7. By default, the most recent snapshot is selected from within Choose a Recovery Point which will reflect the latest snapshot you manually took from the Protect Tab

mceclip7.pngFigure 7: Most recent snapshot (click to enlarge)

Resuming Backups

Once the system has been fully restored, you will need to re-enable backups from the original chain, assuming they have been paused.

1. Navigate to the Protect Tab and click RE-ENABLE AGENT for the agent associated with the Rescue Agent:

mceclip8.pngFigure 8: Re-enable agent (click to enlarge)

2.  Queue up a differential merge, then start a new backup

Archiving and Removing the Rescue Agent

Once a disaster recovery is complete and a rescue agent is no longer needed, you should archive the Rescue Agent so it no longer takes backups, and eventually remove it to free up resources on your Datto device. See SIRIS, ALTO, and NAS: Archiving and removing a Rescue Agent.

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