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