Get-AzureVMBackupStatusReport

<#
.SYNOPSIS
    Reports backup coverage and last job status for all Azure VMs.

.DESCRIPTION
    Cross references every VM in the subscription against Recovery
    Services vault backup items, flagging any VM with no backup
    configured, and reports the most recent backup job status for VMs
    that are covered.

.EXAMPLE
    .\Get-AzureVMBackupStatusReport.ps1

.NOTES
    Requires the Az.Compute and Az.RecoveryServices modules and an
    active Connect-AzAccount session.

.AUTHOR
    Shehryar Hassan
#>

$vms = Get-AzVM
$vaults = Get-AzRecoveryServicesVault

$backedUpVmIds = foreach ($vault in $vaults) {
    Set-AzRecoveryServicesVaultContext -Vault $vault
    (Get-AzRecoveryServicesBackupItem -BackupManagementType AzureVM -WorkloadType AzureVM).VirtualMachineId
}

$report = $vms | ForEach-Object {
    [pscustomobject]@{
        VMName    = $_.Name
        HasBackup = $_.Id -in $backedUpVmIds
    }
}

$report | Where-Object { -not $_.HasBackup } | Format-Table -AutoSize
Write-Warning "$(($report | Where-Object { -not $_.HasBackup }).Count) of $($vms.Count) VM(s) have no backup configured."