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Login to Azure Portal usingĀ https://portal.azure.com.
Navigate to All services.
In All services, enter Recovery Services to list Recovery service Vaults.
From the Recovery service Vaults list select the desired vault.
Select the Backup Policy.
Update the Retention Range for the back up policy to make sure that it beyond the backup period.
Select OK.
Important:
Protect the downloaded key file as it provides access to the virtual machine.
Reference: