Restore: Create Rescue Agent

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Scope

This article describes the function of the Create Rescue Agent option for Datto appliances capable of running local virtualizations.

Rescue Agents do not preserve transactional data. If you are virtualizing an environment that relies on transactional data, such as an Exchange or SQL server, and you need to back it up, start a local virtualization, log into it and configure its networking, and then repair agent communications between the virtual agent and the Datto appliance. Then, start a backup on the Protect tab of the Datto device GUI to resume backups for the agent.
You do not need to have any agent slots available on your Datto appliance to create a Rescue Agent, but creating it does use a slot. If you create the Rescue Agent on a device that has only one slot available, or if the device has reached the maximum number of protected systems that can be paired with it, you will not be able to add additional agents until you remove the Rescue Agent or another agent.

Overview

When starting a local virtualization, you have the option to create a virtual Rescue Agent from the selected snapshot of the Source Agent and take crash-consistent backups of the VM. The feature creates a new backup agent on the Protect tab of the Datto appliance's GUI, and writes all of the Source Agent's configurations and data changes to automatic incremental snapshots. The agent will continue to back itself up until you restore the production machine or its replacement. This ensures that whenever you want to bring the original machine back into service, your data is ready and waiting.

Because the Rescue Agent creates a 'forked' backup set from the Source Agent's snapshots, the only additional space the Rescue Agent will use on your appliance will come from its incremental backups.

Procedure

1. To create a virtualization with a Rescue Agent, start a local virtualization. In the Local Options screen, configure the virtualization, and check the Create Rescue Agent box, as shown in Figure 1

Figure 1: Create Rescue Agent


2. Click Apply, followed by Start VM. You will be prompted to choose whether or not you would like to pause backups on the protected machine. Depending on your recovery scenario, click either Pause Backups or Continue Backups, and then click Confirm.

2.pngFigure 2: Pause or continue backups

3. Your virtualization will mount and begin running in the Local Virtualization screen. On the Protect tab of the Datto appliance GUI, you will see a new agent with a name comprised of the word 'rescue' and the protected server's IP address or FQDN, as shown in Figure 3. This is the Rescue Agent for your running virtualization. You can manage this agent the same way you would manage any other agent, including setting a custom backup schedule for it through the Configure Agent Settings page.

3.pngFigure 3: Rescue Agent, as seen in the Protect tab

4. When you are no longer need the Rescue Agent, remove the protected virtualization from the Restore tab of the Datto appliance GUI, and then remove the Rescue Agent from the Protect tab.


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